27 lines
686 B
JavaScript
27 lines
686 B
JavaScript
|
'use strict';
|
||
|
|
|
||
|
|
var GetIntrinsic = require('get-intrinsic');
|
||
|
|
|
||
|
|
var $RangeError = GetIntrinsic('%RangeError%');
|
||
|
|
|
||
|
|
var ToIntegerOrInfinity = require('./ToIntegerOrInfinity');
|
||
|
|
var ToLength = require('./ToLength');
|
||
|
|
var SameValue = require('./SameValue');
|
||
|
|
|
||
|
|
// https://262.ecma-international.org/8.0/#sec-toindex
|
||
|
|
|
||
|
|
module.exports = function ToIndex(value) {
|
||
|
|
if (typeof value === 'undefined') {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
var integerIndex = ToIntegerOrInfinity(value);
|
||
|
|
if (integerIndex < 0) {
|
||
|
|
throw new $RangeError('index must be >= 0');
|
||
|
|
}
|
||
|
|
var index = ToLength(integerIndex);
|
||
|
|
if (!SameValue(integerIndex, index)) {
|
||
|
|
throw new $RangeError('index must be >= 0 and < 2 ** 53 - 1');
|
||
|
|
}
|
||
|
|
return index;
|
||
|
|
};
|