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- 'use strict';
- var $TypeError = require('es-errors/type');
- var isInteger = require('../helpers/isInteger');
- var callBound = require('call-bind/callBound');
- var $slice = callBound('String.prototype.slice');
- // https://262.ecma-international.org/12.0/#substring
- module.exports = function substring(S, inclusiveStart, exclusiveEnd) {
- if (typeof S !== 'string' || !isInteger(inclusiveStart) || (arguments.length > 2 && !isInteger(exclusiveEnd))) {
- throw new $TypeError('`S` must be a String, and `inclusiveStart` and `exclusiveEnd` must be integers');
- }
- return $slice(S, inclusiveStart, arguments.length > 2 ? exclusiveEnd : S.length);
- };
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