GitHub - sourcevault/nutzen: functional programming utils for pattern matching in JavaScript. When it'll reach stage 4 it will be soon ratified as part of the ECMAScript language (some of you know "JavaScript" is copyrighted by Oracle). The implementation of pattern matching into JavaScript greatly aids in the processing of data for the Internet. functional programming utils for pattern matching in JavaScript. But there is a proposal (currently at stage 1 of the process) that aims to introduce pattern matching in JavaScript. Let's see what's the situation there.Īnd just as predicted, JavaScript doesn't have native pattern matching. But it turns out most dynamically typed languages do not have native pattern matching.Īnd JavaScript is perhaps the most common dynamically typed language. This technique is useful per se, but particularly in dynamically typed languages, as they can't easily discriminate against class names if we're dealing with generic structures. If you need to know if a string matches a regular expression RegExp, use (). The actual implementation comes from RegExp.prototype match (). Pattern matching is a pretty common action performed on entities in order to check if they follow some pattern or not.įor example, an object representing an animal could have a wings property or not, and thanks to its mere presence (out a value greater than 0) we can know which of them are birds or other flying critters. The implementation of itself is very simple it simply calls the Symbol.match method of the argument with the string as the first parameter.
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