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21 lines
802 B
21 lines
802 B
4 years ago
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'use strict';
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var $ = require('../internals/export');
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var flattenIntoArray = require('../internals/flatten-into-array');
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var toObject = require('../internals/to-object');
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var toLength = require('../internals/to-length');
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var toInteger = require('../internals/to-integer');
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var arraySpeciesCreate = require('../internals/array-species-create');
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// `Array.prototype.flat` method
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// https://github.com/tc39/proposal-flatMap
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$({ target: 'Array', proto: true }, {
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flat: function flat(/* depthArg = 1 */) {
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var depthArg = arguments.length ? arguments[0] : undefined;
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var O = toObject(this);
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var sourceLen = toLength(O.length);
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var A = arraySpeciesCreate(O, 0);
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A.length = flattenIntoArray(A, O, O, sourceLen, 0, depthArg === undefined ? 1 : toInteger(depthArg));
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return A;
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}
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});
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