1 | ;
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2 |
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3 | Object.defineProperty(exports, "__esModule", {
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4 | value: true
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5 | });
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6 |
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7 | var _map = require('./map.js');
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8 |
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9 | var _map2 = _interopRequireDefault(_map);
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10 |
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11 | var _wrapAsync = require('./internal/wrapAsync.js');
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12 |
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13 | var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
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14 |
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15 | var _awaitify = require('./internal/awaitify.js');
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16 |
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17 | var _awaitify2 = _interopRequireDefault(_awaitify);
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18 |
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19 | function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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20 |
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21 | /**
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22 | * Sorts a list by the results of running each `coll` value through an async
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23 | * `iteratee`.
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24 | *
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25 | * @name sortBy
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26 | * @static
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27 | * @memberOf module:Collections
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28 | * @method
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29 | * @category Collection
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30 | * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
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31 | * @param {AsyncFunction} iteratee - An async function to apply to each item in
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32 | * `coll`.
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33 | * The iteratee should complete with a value to use as the sort criteria as
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34 | * its `result`.
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35 | * Invoked with (item, callback).
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36 | * @param {Function} callback - A callback which is called after all the
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37 | * `iteratee` functions have finished, or an error occurs. Results is the items
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38 | * from the original `coll` sorted by the values returned by the `iteratee`
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39 | * calls. Invoked with (err, results).
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40 | * @returns {Promise} a promise, if no callback passed
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41 | * @example
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42 | *
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43 | * // bigfile.txt is a file that is 251100 bytes in size
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44 | * // mediumfile.txt is a file that is 11000 bytes in size
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45 | * // smallfile.txt is a file that is 121 bytes in size
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46 | *
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47 | * // asynchronous function that returns the file size in bytes
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48 | * function getFileSizeInBytes(file, callback) {
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49 | * fs.stat(file, function(err, stat) {
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50 | * if (err) {
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51 | * return callback(err);
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52 | * }
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53 | * callback(null, stat.size);
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54 | * });
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55 | * }
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56 | *
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57 | * // Using callbacks
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58 | * async.sortBy(['mediumfile.txt','smallfile.txt','bigfile.txt'], getFileSizeInBytes,
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59 | * function(err, results) {
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60 | * if (err) {
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61 | * console.log(err);
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62 | * } else {
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63 | * console.log(results);
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64 | * // results is now the original array of files sorted by
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65 | * // file size (ascending by default), e.g.
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66 | * // [ 'smallfile.txt', 'mediumfile.txt', 'bigfile.txt']
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67 | * }
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68 | * }
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69 | * );
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70 | *
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71 | * // By modifying the callback parameter the
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72 | * // sorting order can be influenced:
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73 | *
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74 | * // ascending order
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75 | * async.sortBy(['mediumfile.txt','smallfile.txt','bigfile.txt'], function(file, callback) {
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76 | * getFileSizeInBytes(file, function(getFileSizeErr, fileSize) {
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77 | * if (getFileSizeErr) return callback(getFileSizeErr);
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78 | * callback(null, fileSize);
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79 | * });
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80 | * }, function(err, results) {
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81 | * if (err) {
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82 | * console.log(err);
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83 | * } else {
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84 | * console.log(results);
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85 | * // results is now the original array of files sorted by
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86 | * // file size (ascending by default), e.g.
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87 | * // [ 'smallfile.txt', 'mediumfile.txt', 'bigfile.txt']
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88 | * }
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89 | * }
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90 | * );
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91 | *
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92 | * // descending order
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93 | * async.sortBy(['bigfile.txt','mediumfile.txt','smallfile.txt'], function(file, callback) {
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94 | * getFileSizeInBytes(file, function(getFileSizeErr, fileSize) {
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95 | * if (getFileSizeErr) {
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96 | * return callback(getFileSizeErr);
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97 | * }
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98 | * callback(null, fileSize * -1);
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99 | * });
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100 | * }, function(err, results) {
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101 | * if (err) {
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102 | * console.log(err);
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103 | * } else {
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104 | * console.log(results);
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105 | * // results is now the original array of files sorted by
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106 | * // file size (ascending by default), e.g.
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107 | * // [ 'bigfile.txt', 'mediumfile.txt', 'smallfile.txt']
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108 | * }
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109 | * }
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110 | * );
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111 | *
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112 | * // Error handling
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113 | * async.sortBy(['mediumfile.txt','smallfile.txt','missingfile.txt'], getFileSizeInBytes,
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114 | * function(err, results) {
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115 | * if (err) {
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116 | * console.log(err);
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117 | * // [ Error: ENOENT: no such file or directory ]
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118 | * } else {
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119 | * console.log(results);
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120 | * }
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121 | * }
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122 | * );
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123 | *
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124 | * // Using Promises
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125 | * async.sortBy(['mediumfile.txt','smallfile.txt','bigfile.txt'], getFileSizeInBytes)
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126 | * .then( results => {
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127 | * console.log(results);
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128 | * // results is now the original array of files sorted by
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129 | * // file size (ascending by default), e.g.
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130 | * // [ 'smallfile.txt', 'mediumfile.txt', 'bigfile.txt']
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131 | * }).catch( err => {
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132 | * console.log(err);
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133 | * });
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134 | *
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135 | * // Error handling
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136 | * async.sortBy(['mediumfile.txt','smallfile.txt','missingfile.txt'], getFileSizeInBytes)
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137 | * .then( results => {
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138 | * console.log(results);
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139 | * }).catch( err => {
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140 | * console.log(err);
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141 | * // [ Error: ENOENT: no such file or directory ]
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142 | * });
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143 | *
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144 | * // Using async/await
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145 | * (async () => {
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146 | * try {
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147 | * let results = await async.sortBy(['bigfile.txt','mediumfile.txt','smallfile.txt'], getFileSizeInBytes);
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148 | * console.log(results);
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149 | * // results is now the original array of files sorted by
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150 | * // file size (ascending by default), e.g.
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151 | * // [ 'smallfile.txt', 'mediumfile.txt', 'bigfile.txt']
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152 | * }
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153 | * catch (err) {
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154 | * console.log(err);
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155 | * }
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156 | * })();
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157 | *
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158 | * // Error handling
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159 | * async () => {
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160 | * try {
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161 | * let results = await async.sortBy(['missingfile.txt','mediumfile.txt','smallfile.txt'], getFileSizeInBytes);
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162 | * console.log(results);
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163 | * }
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164 | * catch (err) {
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165 | * console.log(err);
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166 | * // [ Error: ENOENT: no such file or directory ]
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167 | * }
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168 | * }
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169 | *
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170 | */
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171 | function sortBy(coll, iteratee, callback) {
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172 | var _iteratee = (0, _wrapAsync2.default)(iteratee);
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173 | return (0, _map2.default)(coll, (x, iterCb) => {
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174 | _iteratee(x, (err, criteria) => {
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175 | if (err) return iterCb(err);
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176 | iterCb(err, { value: x, criteria });
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177 | });
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178 | }, (err, results) => {
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179 | if (err) return callback(err);
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180 | callback(null, results.sort(comparator).map(v => v.value));
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181 | });
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182 |
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183 | function comparator(left, right) {
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184 | var a = left.criteria,
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185 | b = right.criteria;
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186 | return a < b ? -1 : a > b ? 1 : 0;
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187 | }
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188 | }
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189 | exports.default = (0, _awaitify2.default)(sortBy, 3);
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190 | module.exports = exports.default; |
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