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25 lines
944 B
JavaScript
25 lines
944 B
JavaScript
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'use strict';
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var $ = require('../internals/export');
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var $findIndex = require('../internals/array-iteration').findIndex;
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var addToUnscopables = require('../internals/add-to-unscopables');
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var arrayMethodUsesToLength = require('../internals/array-method-uses-to-length');
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var FIND_INDEX = 'findIndex';
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var SKIPS_HOLES = true;
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var USES_TO_LENGTH = arrayMethodUsesToLength(FIND_INDEX);
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// Shouldn't skip holes
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if (FIND_INDEX in []) Array(1)[FIND_INDEX](function () { SKIPS_HOLES = false; });
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// `Array.prototype.findIndex` method
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// https://tc39.github.io/ecma262/#sec-array.prototype.findindex
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$({ target: 'Array', proto: true, forced: SKIPS_HOLES || !USES_TO_LENGTH }, {
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findIndex: function findIndex(callbackfn /* , that = undefined */) {
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return $findIndex(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
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}
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});
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// https://tc39.github.io/ecma262/#sec-array.prototype-@@unscopables
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addToUnscopables(FIND_INDEX);
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