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20 lines
802 B
20 lines
802 B
'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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