Edit File: first-index.js
"use strict"; var toPosInt = require("../../number/to-pos-integer") , value = require("../../object/valid-value") , objHasOwnProperty = Object.prototype.hasOwnProperty; module.exports = function () { var i, length; if (!(length = toPosInt(value(this).length))) return null; i = 0; while (!objHasOwnProperty.call(this, i)) { if (++i === length) return null; } return i; };
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