1. about
2. javascript typescript babel es5 es6
3. test driven development, unit-testing, continuous integration
4. react-redux, modern JS frameworks, JS closures
5. function sum(){/*add code here*/};console.log (sum(3)(5)(7)(3)()); // 18

Question

1. about
2. javascript typescript babel es5 es6
3. test driven development, unit-testing, continuous integration
4. react-redux, modern JS frameworks, JS closures
5. function sum(){/*add code here*/};console.log (sum(3)(5)(7)(3)()); // 18

recursive answer · Accepted Answer

function mySum(val){
	if(val === undefined)  return val;
	return function(val2){
		if(val2 === undefined)  return val;
		return mySum(val + val2);
      }
}

Utilisateur anonyme · Answer

function sum(x) {
	return function(y) {
		return function(z){
			return function(w){
				return function(){
                	return x + y + z + w;
		}
            }
        }
    }
}

Yarik Leto · Answer

var sum = (n) => {
  let result = n;

  const fn = (n) => {
    if (n == null) {
      return result;
    }
    result += n;
    return fn;
  }

  return fn;
}

Yarik Leto · Answer

const sum = (n, res = 0) => (
  n == null ? res : (x) => sum(x, res + n)
);

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