source: imaps-frontend/node_modules/es-abstract/2018/ToIndex.js@ d565449

'use strict';

var $RangeError = require('es-errors/range');

var ToInteger = require('./ToInteger');
var ToLength = require('./ToLength');
var SameValueZero = require('./SameValueZero');

// https://262.ecma-international.org/8.0/#sec-toindex

module.exports = function ToIndex(value) {
        if (typeof value === 'undefined') {
                return 0;
        }
        var integerIndex = ToInteger(value);
        if (integerIndex < 0) {
                throw new $RangeError('index must be >= 0');
        }
        var index = ToLength(integerIndex);
        if (!SameValueZero(integerIndex, index)) {
                throw new $RangeError('index must be >= 0 and < 2 ** 53 - 1');
        }
        return index;
};