In this gist i will try to explain you about partial application

partial_application_in_js.js

const multiply = (a,b,c) =>a*b*c;

//Partial Application
const partiallyMultiplyBy5 = multiply.bind(null,5);
partiallyMultiplyBy5(4,10) //200
// in above example  partiallyMultiplyBy5 partially apply multiply function with 5 as first argument.
// when executing the partiallyMultiplyBy5 function we just have to pass remaining paramater as the first argument 5 has been remember
// due to closure.