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36 lines
1.0 KiB
36 lines
1.0 KiB
"use strict"; |
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var toInteger = require("../../../number/to-integer") |
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, toPosInt = require("../../../number/to-pos-integer") |
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, isPlainArray = require("../../is-plain-array") |
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, isArray = Array.isArray |
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, slice = Array.prototype.slice |
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, objHasOwnProperty = Object.prototype.hasOwnProperty |
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, max = Math.max; |
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module.exports = function (start, end) { |
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var length, result, i; |
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if (!this || !isArray(this) || isPlainArray(this)) { |
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return slice.apply(this, arguments); |
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} |
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length = toPosInt(this.length); |
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start = toInteger(start); |
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if (start < 0) start = max(length + start, 0); |
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else if (start > length) start = length; |
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if (end === undefined) { |
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end = length; |
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} else { |
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end = toInteger(end); |
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if (end < 0) end = max(length + end, 0); |
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else if (end > length) end = length; |
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} |
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if (start > end) start = end; |
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result = new this.constructor(end - start); |
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i = 0; |
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while (start !== end) { |
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if (objHasOwnProperty.call(this, start)) result[i] = this[start]; |
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++i; |
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++start; |
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} |
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return result; |
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};
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