1 | var Value = require('./value')
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2 | var LazyWatcher = require('./lib/lazy-watcher')
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3 | var isSame = require('./lib/is-same')
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4 | var isObservable = require('./is-observable')
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5 | var resolve = require('./resolve')
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6 | var addCollectionMethods = require('./lib/add-collection-methods')
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7 | var forEach = require('./for-each')
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8 |
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9 | module.exports = Array
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10 |
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11 | function Array (defaultValues, opts) {
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12 | var object = []
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13 | var sources = []
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14 | var objectReleases = []
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15 | var fixedIndexing = opts && opts.fixedIndexing || false
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16 |
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17 | var releases = []
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18 | var comparer = opts && opts.comparer || null
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19 |
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20 | var binder = LazyWatcher(update, listen, unlisten)
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21 | binder.value = object
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22 |
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23 | if (opts && opts.idle) binder.idle = true
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24 | if (opts && opts.nextTick) binder.nextTick = true
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25 |
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26 | if (defaultValues && defaultValues.length) {
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27 | forEach(defaultValues, add)
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28 | }
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29 |
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30 | var observable = function MutantArray (listener) {
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31 | if (!listener) {
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32 | return binder.getValue()
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33 | }
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34 | return binder.addListener(listener)
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35 | }
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36 |
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37 |
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38 | addCollectionMethods(observable, sources)
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39 |
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40 | observable.push = function (item) {
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41 | var result = null
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42 | if (arguments.length === 1) {
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43 | result = add(item)
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44 | } else {
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45 | result = []
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46 | for (var i = 0; i < arguments.length; i++) {
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47 | result.push(add(arguments[i]))
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48 | }
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49 | }
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50 | binder.broadcast()
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51 | return result
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52 | }
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53 |
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54 | observable.put = function (index, valueOrObs) {
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55 | valueOrObs = getObsValue(valueOrObs)
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56 | sources[index] = valueOrObs
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57 | object[index] = resolve(valueOrObs)
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58 | if (binder.live) {
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59 | tryInvoke(objectReleases[index])
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60 | objectReleases[index] = bind(valueOrObs)
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61 | }
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62 | binder.broadcast()
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63 | return valueOrObs
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64 | }
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65 |
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66 | observable.insert = function (valueOrObs, at) {
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67 | valueOrObs = getObsValue(valueOrObs)
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68 | sources.splice(at, 0, valueOrObs)
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69 | if (binder.live) objectReleases.splice(at, 0, bind(valueOrObs))
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70 | object.splice(at, 0, resolve(valueOrObs))
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71 | binder.broadcast()
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72 | return valueOrObs
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73 | }
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74 |
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75 | observable.pop = function () {
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76 | var result = sources.pop()
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77 | if (binder.live) tryInvoke(objectReleases.pop())
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78 | object.pop()
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79 | binder.broadcast()
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80 | return result
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81 | }
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82 |
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83 | observable.shift = function () {
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84 | var result = sources.shift()
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85 | if (binder.live) tryInvoke(objectReleases.shift())
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86 | object.shift()
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87 | binder.broadcast()
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88 | return result
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89 | }
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90 |
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91 | observable.clear = function () {
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92 | objectReleases.forEach(tryInvoke)
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93 | sources.length = 0
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94 | objectReleases.length = 0
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95 | object.length = 0
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96 | binder.broadcast()
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97 | }
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98 |
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99 | observable.delete = function (valueOrObs) {
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100 | observable.deleteAt(sources.indexOf(valueOrObs))
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101 | }
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102 |
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103 | observable.deleteAt = function (index) {
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104 | if (index >= 0 && index < sources.length) {
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105 | sources.splice(index, 1)
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106 | if (binder.live) objectReleases.splice(index, 1).forEach(tryInvoke)
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107 | object.splice(index, 1)
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108 | binder.broadcast()
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109 | }
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110 | }
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111 |
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112 | observable.transaction = function (cb) {
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113 | binder.transaction(observable, cb)
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114 | }
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115 |
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116 | observable.set = function (values) {
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117 | var changed = false
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118 | if (fixedIndexing) {
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119 | var length = values && values.length || 0
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120 | for (var i = 0; i < length; i++) {
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121 | if (isObservable(values[i])) {
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122 | if (values[i] !== sources[i]) {
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123 | tryInvoke(objectReleases[index])
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124 | sources[i] = values[i]
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125 | changed = true
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126 | if (binder.live) {
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127 | objectReleases[i] = bind(sources[i])
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128 | }
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129 | }
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130 | } else if (sources[i] && sources[i]._type === 'MutantArrayValue') {
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131 | if (!isSame(sources[i](), values[i], comparer)) {
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132 | sources[i].set(values[i])
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133 | changed = true
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134 | }
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135 | } else {
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136 | tryInvoke(objectReleases[index])
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137 | sources[i] = getObsValue(values[i])
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138 | changed = true
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139 | if (binder.live) {
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140 | objectReleases[i] = bind(sources[i])
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141 | }
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142 | }
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143 | }
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144 | for (var index = length; index < sources.length; index++) {
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145 | tryInvoke(objectReleases[index])
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146 | changed = true
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147 | }
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148 |
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149 | if (changed) {
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150 | objectReleases.length = length
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151 | sources.length = length
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152 | object.length = length
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153 | binder.broadcast()
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154 | }
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155 | } else {
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156 | unlisten()
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157 | sources.length = 0
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158 | objectReleases.length = 0
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159 | object.length = 0
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160 | forEach(values, add)
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161 | if (binder.live) {
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162 | listen()
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163 | binder.broadcast()
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164 | }
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165 | }
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166 | }
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167 |
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168 | return observable
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169 |
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170 |
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171 |
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172 | function getObsValue (valueOrObs) {
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173 | if (fixedIndexing && !isObservable(valueOrObs)) {
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174 | valueOrObs = Value(valueOrObs)
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175 | valueOrObs._type = 'MutantArrayValue'
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176 | }
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177 | return valueOrObs
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178 | }
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179 |
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180 | function add (valueOrObs) {
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181 | valueOrObs = getObsValue(valueOrObs)
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182 | sources.push(valueOrObs)
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183 | object.push(resolve(valueOrObs))
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184 | if (binder.live) {
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185 | objectReleases.push(bind(valueOrObs))
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186 | }
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187 | return valueOrObs
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188 | }
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189 |
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190 | function bind (valueOrObs) {
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191 | return typeof valueOrObs === 'function' ? valueOrObs(binder.onUpdate) : null
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192 | }
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193 |
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194 | function listen () {
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195 | sources.forEach(function (obs, i) {
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196 | objectReleases[i] = bind(obs)
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197 | })
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198 |
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199 | if (opts && opts.onListen) {
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200 | var release = opts.onListen()
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201 | if (typeof release === 'function') {
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202 | releases.push(release)
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203 | }
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204 | }
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205 | }
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206 |
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207 | function unlisten () {
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208 | objectReleases.forEach(tryInvoke)
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209 | objectReleases.length = 0
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210 |
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211 | while (releases.length) {
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212 | tryInvoke(releases.pop())
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213 | }
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214 |
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215 | if (opts && opts.onUnlisten) {
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216 | opts.onUnlisten()
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217 | }
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218 | }
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219 |
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220 | function update () {
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221 | var changed = false
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222 | sources.forEach(function (source, i) {
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223 | var newValue = resolve(source)
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224 | if (!isSame(newValue, object[i], comparer)) {
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225 | object[i] = newValue
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226 | changed = true
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227 | }
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228 | })
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229 | return changed
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230 | }
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231 | }
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232 |
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233 | function tryInvoke (func) {
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234 | if (typeof func === 'function') {
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235 | func()
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236 | }
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237 | }
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