function

How do JavaScript closures work?

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A closure is a pairing of: A function and A reference to that function’s outer scope (lexical environment) A lexical environment is part of every execution context (stack frame) and is a map between identifiers (i.e. local variable names) and values. Every function in JavaScript maintains a reference to its outer lexical environment. This reference … Read more

Javascript function executed in this pattern “xyz()()” throws error?

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It would only work if recursiveSum would return a function. Right now, you try to execute the return value of recursiveSum(1) as a function. It isn’t (it’s undefined), and thus an error is thrown; you try to execute undefined(2)(3). You could do something like this. function currySum(x) { return function(y) { return function(z) { return … Read more