b4b889ee9e
Intentionally used the word `rest` instead of `args` because I felt for this case rest better helps people understand that , rest holds all the args after first arg. If I have used `args` then it partly implies that first is not an arg which is not true
507 B
507 B
flip
Flip takes a function as an argument, then makes the first argument the last.
Return a closure that takes variadic inputs, and splices the last argument to make it the first argument before applying the rest.
const flip = fn => (first, ...rest) => fn(...rest, first);
let a = { name: 'John Smith' };
let b = {};
const mergeFrom = flip(Object.assign);
let mergePerson = mergeFrom.bind(null, a);
mergePerson(b); // == b
b = {};
Object.assign(b, a); // == b