Javascript: What is function with two parenthesis brackets ()()?

Question

I recall somewhere seeing a function with two parenthesis brackets ()() like:

function add_numbers(number1)(number2)

What do you call such a function and what’s its usage?

Thank you in advance and will be sure to vote up/accept answer

score 1 · Answer 1 · edited May 23 '17 at 12:18

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It is called function currying. The first bracket returns another function(lets call it: "myCustomFunc"). The 2nd bracket actually passes the 2nd value (number2) to the myCustomFunc.

edited May 23 '17 at 12:18

Community

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answered May 05 '17 at 18:16

Raja Rao

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score 0 · Answer 2 · edited May 23 '17 at 12:02

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Going off of this answer, the add_numbers function takes one argument (number1) and returns a function, which is then called with argument number2.

edited May 23 '17 at 12:02

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answered May 05 '17 at 18:17

pellucidcoder

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My question? I don't understand – pellucidcoder May 05 '17 at 21:43
Basically, function 1 takes one argument, and returns a function, let's call it function 2, which takes another argument and returns a result. – ndrewxie Jan 19 '18 at 18:55

Javascript: What is function with two parenthesis brackets ()()?

2 Answers2