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17 lines
369 B
17 lines
369 B
10 years ago
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'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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, hasOwnProperty = Object.prototype.hasOwnProperty;
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module.exports = function () {
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var i, l;
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if (!(l = toPosInt(value(this).length))) return null;
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i = 0;
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while (!hasOwnProperty.call(this, i)) {
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if (++i === l) return null;
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}
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return i;
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};
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