Constnium/node_modules/es-abstract/2022/substring.js
2022-06-23 02:27:43 +02:00

20 lines
740 B
JavaScript

'use strict';
var GetIntrinsic = require('get-intrinsic');
var $TypeError = GetIntrinsic('%TypeError%');
var IsIntegralNumber = require('./IsIntegralNumber');
var Type = require('./Type');
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 (Type(S) !== 'String' || !IsIntegralNumber(inclusiveStart) || (arguments.length > 2 && !IsIntegralNumber(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);
};