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neftaly/curry.js

Last active April 10, 2022 18:47
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ES6 Auto-curry
Raw
curry.js
const curry = (fn, preArgs = []) => (...postArgs) => {
const args = [...preArgs, ...postArgs]; // Combine old and new arguments
if (args.length < fn.length) { // Check ig enough arguments received
return curry(fn, args); // Recurse to emit an argument receiver fn
}
return fn(...args); // Finished; Apply arguments to fn and return result
};
Raw
test.js
const add3 = function (a, b, c) {
return a + b + c;
};
const x = curry(add3);
x(1)(1)(1); //=> 3
x(1, 1)(1); //=> 3
x(1, 1, 1); //=> 3
@meChrisReed
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meChrisReed commented Nov 30, 2015

I like what you have here.
I think you can reduce this to:

const curry = (fn, ...args) => (
  args.length === fn.length ?
    fn(...args) :
    curry.bind(null, fn, ...args)
);

const add3 = curry((a,b,c) => a+b+c);
add3(1)(1)(1); //=> 3
add3(1, 1)(1); //=> 3
add3(1, 1, 1); //=> 3

Please let me know your thoughts or if there is some functionality lost.

@neftaly
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neftaly commented Jun 21, 2016

Looks good! This was actually for explaining how auto-currying worked in a talk, so I wouldn't have used bind (too much cognitive load for audience), but it'd be great otherwise.

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