![]() ![]() slice() for all your string and array slicing needs. Not only does it not have a parallel array method, it is not part of the core JavaScript language and may be removed in the future. But the second parameter is the length to extract. The first parameter is the usual start character index. The last one is ( /en-US/docs/Web/JavaSc.). The slice () function is a string function of Node.js which is used to extract sub-string from a string. I thought you said there were three methods? slice() means you can use it for two different datatypes. And () has a parallel method for arrays called ( /en-US/docs/Web/JavaSc.). substring() instead? Well, simply because you have to choose one. slice() which will simply return an empty string. substring() will swap the two parameters. ![]() substring() is negative, it’s treated as zero. ( /en-US/docs/Web/JavaSc.) is very similar to. slice() starts from the end of the string and works backwards. This works because when startIndex is negative. Instead of writing RIGHT('The quick brown fox', 3), you can write… 'The quick brown fox'. Instead of writing LEFT('The quick brown fox', 3), you can write… 'The quick brown fox'. I like using LEFT() and RIGHT() in other languages slice() will simply return characters all the way to the end of the string. It may be helpful to think of an “index” as the spaces between characters, starting at zero.ĮndIndex is optional. ( /en-US/docs/Web/JavaSc.) takes two parameters.īeginIndex - The index of the first character to returnĮndIndex - The index of the last character to return ![]() Which one should you use? The answer may depend on the context of your problem, but in the interest of keeping things simple, I say just use. In JavaScript, there are three prototype methods for getting part of a string. ![]()
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