JavaScript: Takes a function as an argument, then makes the first argument the last

JavaScript fundamental (ES6 Syntax): Exercise-232 with Solution

Write a JavaScript program that takes a function as an argument, then makes the first argument the last.

• Use argument destructuring and a closure with variadic arguments.
• Splice the first argument, using the spread operator (...), to make it the last before applying the rest.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
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 = {};
console.log(Object.assign(b, a)); // == b

Sample Output:

{"name":"John Smith"}

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-232-1 by w3resource (@w3resource) on CodePen.

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