What is TypeScript and why would I use it in place of JavaScript? [closed]

I originally wrote this answer when TypeScript was still hot-off-the-presses. Five years later, this is an OK overview, but look at Lodewijk’s answer below for more depth 1000ft view… TypeScript is a superset of JavaScript which primarily provides optional static typing, classes and interfaces. One of the big benefits is to enable IDEs to provide a richer environment … Read more

For-each over an array in JavaScript

TL;DR Your best bets are usually a for-of loop (ES2015+ only; spec | MDN) – simple and async-friendly forEach (ES5+ only; spec | MDN) (or its relatives some and such) – not async-friendly (but see details) a simple old-fashioned for loop – async-friendly (rarely) for-in with safeguards – async-friendly Some quick “don’t”s: Don’t use for-in … Read more

What does “javascript:void(0)” mean?

The void operator evaluates the given expression and then returns undefined. The void operator is often used merely to obtain the undefined primitive value, usually using “void(0)” (which is equivalent to “void 0”). In these cases, the global variable undefined can be used instead (assuming it has not been assigned to a non-default value). An … Read more

What’s the difference between “{}” and “[]” while declaring a JavaScript array?

Nobody seems to be explaining the difference between an array and an object. [] is declaring an array. {} is declaring an object. An array has all the features of an object with additional features (you can think of an array like a sub-class of an object) where additional methods and capabilities are added in … Read more

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