Currying Example

currying.js

(function (){
    const double = (x) => x*2
    const output = [1,2,3].map(double);
    console.log(output) // [2,4,6]

    // Currying 
    const mult = (i) => (x) => x*i
    let aMod = (arr) => (mult) => arr.map(mult);
    const arr = [1,2,3];
    console.log(aMod(arr)(mult(2)));
    console.log(aMod(arr)(mult(3)));

    // Currying alternative?
    console.log(arr.map(x=>x*2))
    console.log(arr.map(x=>x*3))

    // Seems nicer to just use map, but see here:
    const ijk = (i,j,k) => (x) => [x*i,x*j,x*k];
    console.log(aMod(arr)(ijk(1,2,3)));
    console.log(aMod(arr)(ijk(2,3,4)));

    // versus
    console.log(arr.map(x=>[x*1,x*2,x*3]))
    console.log(arr.map(x=>[x*2,x*3,x*4]))

    // lets change aMod a tiny bit to support multiple arrays
    const aaMod = (aarr) => (fn) => aarr.map(e=>aMod(e)(fn));
    arrays = [
        [1,2,3],
        [4,5,6]
    ];
    console.log(aaMod(arrays)(ijk(1,2,3)))
    console.log(aaMod(arrays)(ijk(2,3,4)))

    // Yeah... I'm not going to write this one in basic maps.
    // If you were doing any sort of linear algebra this
    // would start to become very useful.

})();