You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 

20 lines
740 B

'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);
};