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31 lines
955 B
31 lines
955 B
"use strict"; |
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var numberIsNaN = require("../../number/is-nan") |
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, toPosInt = require("../../number/to-pos-integer") |
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, value = require("../../object/valid-value") |
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, lastIndexOf = Array.prototype.lastIndexOf |
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, objHasOwnProperty = Object.prototype.hasOwnProperty |
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, abs = Math.abs |
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, floor = Math.floor; |
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module.exports = function (searchElement /*, fromIndex*/) { |
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var i, fromIndex, val; |
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if (!numberIsNaN(searchElement)) { |
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// Jslint: ignore |
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return lastIndexOf.apply(this, arguments); |
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} |
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value(this); |
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fromIndex = arguments[1]; |
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if (isNaN(fromIndex)) fromIndex = toPosInt(this.length) - 1; |
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else if (fromIndex >= 0) fromIndex = floor(fromIndex); |
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else fromIndex = toPosInt(this.length) - floor(abs(fromIndex)); |
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for (i = fromIndex; i >= 0; --i) { |
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if (objHasOwnProperty.call(this, i)) { |
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val = this[i]; |
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if (numberIsNaN(val)) return i; // Jslint: ignore |
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} |
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} |
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return -1; |
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};
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