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20 lines
740 B
20 lines
740 B
'use strict'; |
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var GetIntrinsic = require('get-intrinsic'); |
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var $TypeError = GetIntrinsic('%TypeError%'); |
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var IsIntegralNumber = require('./IsIntegralNumber'); |
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var Type = require('./Type'); |
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var callBound = require('call-bind/callBound'); |
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var $slice = callBound('String.prototype.slice'); |
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// https://262.ecma-international.org/12.0/#substring |
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module.exports = function substring(S, inclusiveStart, exclusiveEnd) { |
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if (Type(S) !== 'String' || !IsIntegralNumber(inclusiveStart) || (arguments.length > 2 && !IsIntegralNumber(exclusiveEnd))) { |
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throw new $TypeError('`S` must be a String, and `inclusiveStart` and `exclusiveEnd` must be integers'); |
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} |
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return $slice(S, inclusiveStart, arguments.length > 2 ? exclusiveEnd : S.length); |
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};
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