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| 1 <!DOCTYPE html> | 1 <!DOCTYPE html> |
| 2 <!-- | 2 <!-- |
| 3 Copyright (c) 2014 The Chromium Authors. All rights reserved. | 3 Copyright (c) 2014 The Chromium Authors. All rights reserved. |
| 4 Use of this source code is governed by a BSD-style license that can be | 4 Use of this source code is governed by a BSD-style license that can be |
| 5 found in the LICENSE file. | 5 found in the LICENSE file. |
| 6 --> | 6 --> |
| 7 | 7 |
| 8 <link rel="import" href="/tracing/base/base.html"> | 8 <link rel="import" href="/tracing/base/base.html"> |
| 9 | 9 |
| 10 <script> | 10 <script> |
| (...skipping 245 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
| 256 const result = {}; | 256 const result = {}; |
| 257 const length = array.length; | 257 const length = array.length; |
| 258 for (let i = 0; i < length; i++) { | 258 for (let i = 0; i < length; i++) { |
| 259 const value = array[i]; | 259 const value = array[i]; |
| 260 const key = valueToKeyFn.call(opt_this, value); | 260 const key = valueToKeyFn.call(opt_this, value); |
| 261 result[key] = value; | 261 result[key] = value; |
| 262 } | 262 } |
| 263 return result; | 263 return result; |
| 264 } | 264 } |
| 265 | 265 |
| 266 /** Returns the value passed in. */ | |
| 267 function identity(d) { | |
| 268 return d; | |
| 269 } | |
| 270 | |
| 271 /** | 266 /** |
| 272 * Returns the index of the first element in |ary| for which |opt_func| | 267 * Returns the index of the first element in |ary| for which |opt_func| |
| 273 * returns a truthy value. | 268 * returns a truthy value. |
| 274 * | 269 * |
| 275 * @param {!Array} ary The array being searched | 270 * @param {!Array} ary The array being searched |
| 276 * @param {function(*): *=} opt_func The test function which accepts an array | 271 * @param {function(*): *=} opt_func The test function which accepts an array |
| 277 * element and returns a value that is coerced to a boolean. Defaults to | 272 * element and returns a value that is coerced to a boolean. Defaults to |
| 278 * the identity function. | 273 * the identity function. |
| 279 * @param {*=} opt_this Optional 'this' context for opt_func. | 274 * @param {*=} opt_this Optional 'this' context for opt_func. |
| 280 */ | 275 */ |
| 281 function findFirstIndexInArray(ary, opt_func, opt_this) { | 276 function findFirstIndexInArray(ary, opt_func, opt_this) { |
| 282 const func = opt_func || identity; | 277 const func = opt_func || (x => x); |
| 283 for (let i = 0; i < ary.length; i++) { | 278 for (let i = 0; i < ary.length; i++) { |
| 284 if (func.call(opt_this, ary[i], i)) return i; | 279 if (func.call(opt_this, ary[i], i)) return i; |
| 285 } | 280 } |
| 286 return -1; | 281 return -1; |
| 287 } | 282 } |
| 288 | 283 |
| 289 /** | 284 /** |
| 290 * Returns the value of the first element in |ary| for which |opt_func| | 285 * Returns the value of the first element in |ary| for which |opt_func| |
| 291 * returns a truthy value. | 286 * returns a truthy value. |
| 292 * | 287 * |
| (...skipping 14 matching lines...) Expand all Loading... |
| 307 * a truthy value. | 302 * a truthy value. |
| 308 * | 303 * |
| 309 * @param {!Object} dict The dictionary being searched. | 304 * @param {!Object} dict The dictionary being searched. |
| 310 * @param {function(*, *): *=} opt_func The test function which accepts a | 305 * @param {function(*, *): *=} opt_func The test function which accepts a |
| 311 * dictionary key as its first parameter, the corresponding dictionary | 306 * dictionary key as its first parameter, the corresponding dictionary |
| 312 * value as its second parameter, and returns a value that is coerced to a | 307 * value as its second parameter, and returns a value that is coerced to a |
| 313 * boolean. Defaults to the identity function (which returns the key). | 308 * boolean. Defaults to the identity function (which returns the key). |
| 314 * @param {*=} opt_this Optional 'this' context for opt_func. | 309 * @param {*=} opt_this Optional 'this' context for opt_func. |
| 315 */ | 310 */ |
| 316 function findFirstKeyInDictMatching(dict, opt_func, opt_this) { | 311 function findFirstKeyInDictMatching(dict, opt_func, opt_this) { |
| 317 const func = opt_func || identity; | 312 const func = opt_func || (x => x); |
| 318 for (const key in dict) { | 313 for (const key in dict) { |
| 319 if (func.call(opt_this, key, dict[key])) { | 314 if (func.call(opt_this, key, dict[key])) { |
| 320 return key; | 315 return key; |
| 321 } | 316 } |
| 322 } | 317 } |
| 323 return undefined; | 318 return undefined; |
| 324 } | 319 } |
| 325 | 320 |
| 326 /** Returns the values in an ES6 Map object. */ | 321 /** Returns the values in an ES6 Map object. */ |
| 327 function mapValues(map) { | 322 function mapValues(map) { |
| (...skipping 21 matching lines...) Expand all Loading... |
| 349 comparePossiblyUndefinedValues, | 344 comparePossiblyUndefinedValues, |
| 350 dictionaryContainsValue, | 345 dictionaryContainsValue, |
| 351 getOnlyElement, | 346 getOnlyElement, |
| 352 getFirstElement, | 347 getFirstElement, |
| 353 groupIntoMap, | 348 groupIntoMap, |
| 354 mapItems, | 349 mapItems, |
| 355 filterItems, | 350 filterItems, |
| 356 inPlaceFilter, | 351 inPlaceFilter, |
| 357 invertArrayOfDicts, | 352 invertArrayOfDicts, |
| 358 arrayToDict, | 353 arrayToDict, |
| 359 identity, | |
| 360 findFirstIndexInArray, | 354 findFirstIndexInArray, |
| 361 findFirstInArray, | 355 findFirstInArray, |
| 362 findFirstKeyInDictMatching, | 356 findFirstKeyInDictMatching, |
| 363 mapValues, | 357 mapValues, |
| 364 setsEqual, | 358 setsEqual, |
| 365 }; | 359 }; |
| 366 }); | 360 }); |
| 367 </script> | 361 </script> |
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Chromium Code Reviews
Issue 2955053002:
Remove tr.b.identity. (Closed)
