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I asked a question about currying and closures were mentioned. What is a closure? How does it relate to currying?
What's important here is the closure, which is the set of free variables from the environment of your lambda that need to be saved somewhere. It didn't took too long for people to start calling the actual data structure they use in their language's implementations to implement closure as the "closure" itself.
Note though that a closure doesn't need to be a self-invoking function, but it can be. When a closure is self invoking (i.e. immediately called by adding () after the function), this means the return value is immediately calculated, rather than the function being returned and the return value being calculated later once the function is invoked.
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 is used to configure the execution context ...