What is a practical use case for currying in JavaScript?
Creating specialized functions from general ones. For example, currying a log function with a level parameter creates info and error loggers. Currying an event handler with an action creates click and submit handlers.
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More FAQs in Currying and Partial Application With Closures in JavaScript
Transforming a function that takes multiple arguments into a sequence of functions that each take one argument. f(a, b, c) becomes f(a)(b)(c). Each partial call returns a new function that closes over the accumulated arguments.
Fixing some arguments of a function and returning a new function for the remaining arguments. f(a, b, c) with a preset becomes f'(b, c). The returned function closes over the preset arguments.
Currying transforms a function into a chain of single-argument functions (f(a)(b)(c)). Partial application fixes some arguments and returns a function for the rest (f(a, b, c) with a preset becomes f'(b, c)).
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