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30 lines
838 B
JavaScript
30 lines
838 B
JavaScript
'use strict';
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var 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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, hasOwnProperty = Object.prototype.hasOwnProperty
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, abs = Math.abs, 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 (searchElement === searchElement) { //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 (hasOwnProperty.call(this, i)) {
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val = this[i];
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if (val !== 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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