A closure is a function-scoped object that is created temporarily each time the outer function is called. Because the inner function’s scope chain contains the scope object of the outer function, and…

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Each function has the same variable I in its scope chain, and when we execute the subfunctions in the array, the loop inside Foo has ended, and i = 10 , so each function call prints 10. ES6 makes it easier to fix such a problem by introducing let declaration variables that give JavaScript a block-level scope. Currying is a technique that can decompose a function that takes more than one parameter into many functions.

What are Closures?