16 lines
507 B
JavaScript
16 lines
507 B
JavaScript
var global = require('../internals/global');
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var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');
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var toLength = require('../internals/to-length');
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var RangeError = global.RangeError;
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// `ToIndex` abstract operation
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// https://tc39.es/ecma262/#sec-toindex
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module.exports = function (it) {
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if (it === undefined) return 0;
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var number = toIntegerOrInfinity(it);
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var length = toLength(number);
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if (number !== length) throw RangeError('Wrong length or index');
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return length;
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};
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