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9 |
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10 | # obj-filter - JavaScript Object Filter / Merger.
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11 |
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12 | JavaScript Object Filter. **Deep** filtering key/content *recursively*.
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13 | Support **type checking**, **wildcard**, **nested**, and **filter function** in *template*.
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14 |
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15 | ## INSTALL
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16 |
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17 | `npm i obj-filter`
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18 |
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19 | Or find help from:
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20 | - https://www.npmjs.com/package/obj-filter
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21 | - https://github.com/BlueT/obj-filter
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22 |
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23 | ## SYNOPSIS
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24 |
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25 | ~~~~ js
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26 | "use strict";
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27 |
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28 | const {filter, merge, exist, ArrayIter} = require('obj-filter');
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29 |
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30 | const template = {
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31 | "runtime": {
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32 | "connectionState": undefined, // excluded
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33 | "powerState": function (args) {return "HELLO WORLD " + args}, // pass into the checker function
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34 | "bootTime": "my boot time", // included
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35 | "paused": false,
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36 | "snapshotInBackground": 1111111,
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37 | "numbers": ArrayIter(filter, Number), // value of "numbers" must be an array, and will check all elements in the array
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38 | },
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39 | "running": Boolean
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40 | };
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41 |
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42 | let clean_data = filter( template, fetchData() );
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43 | let updated_data = filter.merge( clean_data, newUpdates() );
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44 | let clean_full_data = filter.exist( template, fetchData() );
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45 | ~~~~
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46 |
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47 | ## Template Object
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48 | According to the **Template Object structure**, `obj-filter` supports the following types of value with different behaviors to build the result object.
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49 |
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50 | ### undefined
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51 | If the *value* of the key is `undefined`, the key will be **filtered** (skipped) and will not included in result object.
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52 |
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53 | ### object
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54 | If the *value* of the key is an `object`, `obj-filter` will _dive into it and check the **deeper** level of keys_.
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55 |
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56 | ### function
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57 | If the *value* of the key is an `function`, `obj-filter` will _pass the **value** of the same key in **input data** to the **function**_, and includes it's returned data in result.
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58 | So it's your call to customize how you would like to handle, define what you want to do with the input data. Be sure to **return something** from your function.
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59 |
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60 | - If return `undefined`, the key will be **filtered** (skipped).
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61 | - If return anything else, the key will be **included**.
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62 |
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63 | ### DataTypes / Constructors
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64 | `String`, `Number`, `Boolean`, `Array`, `Symbol`, `Map`, `Set`, `WeakMap`, `WeakSet`, `Object`, `Function` in template will do type checking on target object.
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65 |
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66 | Success if type matches and fails if they don't.
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67 |
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68 | ### Anything else (string, array, number, etc)
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69 | The value of the key will be **included**.
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70 |
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71 | ### onException callback function
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72 | You can pass an additional `onException` callback function into `filter()`, `filter.merge()`, and `filter.exist()` to handle exceptions.
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73 |
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74 | `onException(template, input, error_msg)` will be called when data expected but type mismatch or undefined.
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75 |
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76 | ~~~~ js
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77 | filter(template, data, (tpl, obj, err) => { console.dir({tpl, obj, err}); return undefined; });
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78 | ~~~~
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79 |
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80 |
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81 | ## ArrayIter Check Array Elements
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82 |
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83 | If you want to check `values of array`, use `ArrayIter`. It makes sure that value must be an Array and checks all elements in the array.
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84 |
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85 | The first two arguments are required:
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86 | - (required) filter / merge / exist
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87 | - (required) template
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88 | - (optional) option
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89 | - min: an Integer, default `0`. indicates at least how many elements must be valid. If the result array contains elements fewer than that number, the whole result will be `undefined`.
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90 | - onException: a Function, will be called when exception occurred.
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91 |
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92 | ~~~~ js
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93 | const template = {
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94 | "a1": ArrayIter(filter, {
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95 | "a": String,
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96 | "a11": ArrayIter(
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97 | exist,
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98 | Number,
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99 | {"onException": () => undefined}
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100 | ),
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101 | "a12": ArrayIter(merge, {
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102 | "a121": filter.ArrayIter(filter, Number, {"min": 3})
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103 | }),
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104 | }),
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105 | "a2": ArrayIter(filter, Number)
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106 | };
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107 | ~~~~
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108 |
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109 |
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110 | ## Default Function
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111 |
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112 | ### Keep only wanted data
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113 |
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114 | When fetching data through API, sometimes the returned data could be Huge. You need many of them, but there are also too many trash included in returned data.
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115 | Copying with `result[xxx] = input[xxx];` each by each, line by line, is a hell.
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116 | Now you can copy one returned data structure (in JSON) to your favorite text editor, delete all unwanted lines, paste it back to your code, and use it as template.
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117 |
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118 | ~~~~ js
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119 | "use strict";
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120 |
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121 | var filter = require('obj-filter');
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122 |
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123 | var template = {
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124 | "runtime": {
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125 | "connectionState": undefined, // In Template, when the value is undefined, the key will be ignored.
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126 | "powerState": function (args) {return "HELLO WORLD " + args}, // pass data into your function, and use it as result value
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127 | "bootTime": "my boot time", // The string is just for your own note. Will keep whatever input is in result.
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128 | "paused": false, // Will keep whatever input is in result.
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129 | "snapshotInBackground": 1111111 // Will keep whatever input is in result.
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130 | }
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131 | };
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132 |
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133 | var data = function_or_somewhere();
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134 |
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135 | // Assume:
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136 | // var data = {
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137 | // "vm": {
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138 | // "type": "VirtualMachine"
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139 | // },
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140 | // "runtime": {
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141 | // "device": 9999,
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142 | // "connectionState": "connected",
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143 | // "powerState": "poweredOn",
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144 | // "bootTime": "2017-04-20T13:56:19.377Z",
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145 | // "paused": false,
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146 | // "snapshotInBackground": true
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147 | // }
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148 | //};
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149 |
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150 |
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151 | var clean_data = filter(template, data);
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152 |
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153 | // clean_data is:
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154 | {
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155 | "runtime": {
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156 | "powerState": "HELLO WORLD poweredOn",
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157 | "bootTime": "2017-04-20T13:56:19.377Z",
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158 | "paused": false,
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159 | "snapshotInBackground": true
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160 | }
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161 | };
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162 | ~~~~
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163 |
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164 | ### User Data Checks
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165 |
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166 | Validate user input data in browser (before send to server), or check them at server-side.
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167 |
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168 | ~~~~ js
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169 | var template = {
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170 | email: validateEmail(email), // call function validateEmail and use it's return value as value
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171 | username: function (username) {
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172 | if (/^[a-zA-Z_]+$/.test(username)) { // check if username contains only a-z or underscore
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173 | return username;
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174 | } else {
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175 | throw new Error('Invalid username');
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176 | }
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177 | },
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178 | password: "original password" // keep whatever user inputs
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179 | }
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180 |
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181 | save_or_send( filter(template, inputData) );
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182 | ~~~~
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183 |
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184 | ### Separated template file
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185 |
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186 | You can save template into separated files.
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187 |
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188 | Say _data_template/vmInfo.js_
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189 |
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190 | ~~~~ js
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191 | {
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192 | "runtime": {
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193 | "connectionState": undefined,
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194 | "powerState": function (args) {return "HELLO WORLD " + args},
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195 | "bootTime": "my boot time",
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196 | "paused": false,
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197 | "snapshotInBackground": 1111111
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198 | }
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199 | };
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200 | ~~~~
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201 |
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202 | Require it as template
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203 |
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204 | ~~~~ js
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205 | var vm_tpl = require('data_template/vmInfo.js');
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206 |
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207 | var vmData = filter(vm_tpl, yourData)
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208 | ~~~~
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209 |
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210 | ## `merge` Function
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211 |
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212 | ### Keep template keys when not provided in input data.
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213 |
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214 | ~~~~ js
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215 | "use strict";
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216 |
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217 | var filter = require('obj-filter');
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218 |
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219 | var template = {
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220 | "runtime": {
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221 | "connectionState": undefined,
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222 | "powerState": function (args) {return "HELLO WORLD " + args},
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223 | "CoffeeTeaOrMe": "Me"
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224 | }
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225 | };
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226 |
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227 | var newUpdates = fetchChanges();
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228 |
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229 | // Assume:
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230 | // var newUpdates = {
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231 | // "runtime": {
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232 | // "connectionState": "connected",
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233 | // "powerState": "poweredOn"
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234 | // }
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235 | //};
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236 |
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237 |
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238 | var updated_data = filter.merge(template, newUpdates);
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239 |
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240 | // updated_data is:
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241 | {
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242 | "runtime": {
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243 | "powerState": "HELLO WORLD poweredOn",
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244 | "bootTime": "2017-04-20T13:56:19.377Z",
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245 | "CoffeeTeaOrMe": "Me"
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246 | }
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247 | };
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248 | ~~~~
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249 |
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250 |
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251 | ## `exist` Function
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252 |
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253 | ### Similar to default `filter`, but All Keys in template must also exists in input data.
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254 |
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255 | ~~~~ js
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256 | "use strict";
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257 |
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258 | var filter = require('obj-filter');
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259 |
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260 | var template = {
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261 | "vm": undefined,
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262 | "runtime": {
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263 | "connectionState": undefined,
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264 | "powerState": function (args) {return "HELLO WORLD " + args},
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265 | "bootTime": "my boot time",
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266 | "obj jj": { "kk": "yy" }
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267 | }
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268 | };
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269 |
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270 | var data = fetch_from_somewhere();
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271 |
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272 | // Assume:
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273 | // var data = {
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274 | // "runtime": {
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275 | // "device": 9999,
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276 | // "connectionState": "connected",
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277 | // "powerState": "poweredOn",
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278 | // "bootTime": 2,
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279 | // "obj jj": { "kk": "zz" }
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280 | // }
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281 | // };
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282 |
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283 |
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284 | var clean_full_data = filter.exist(template, data);
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285 |
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286 | // clean_full_data is:
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287 | {
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288 | "runtime": {
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289 | "powerState": "HELLO WORLD poweredOn",
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290 | "bootTime": 2,
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291 | "obj jj": { "kk": "zz" }
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292 | }
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293 | };
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294 | ~~~~
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295 |
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296 | ## Contribute
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297 |
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298 | PRs welcome!
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299 | If you use/like this module, please don't hesitate to give me a **Star**. I'll be happy whole day!
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300 |
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301 | _Hope this module can save your time, a tree, and a kitten._
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302 |
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303 |
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304 | ## License
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305 | [![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2Fbluet%2Fobj-filter.svg?type=large)](https://app.fossa.io/projects/git%2Bgithub.com%2Fbluet%2Fobj-filter?ref=badge_large) |
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