Write a sum method which will work properly when invoked using either syntax below.

console.log(sum(2,3)); // Outputs 5
console.log(sum(2)(3)); // Outputs 5

Question

Write a sum method which will work properly when invoked using either syntax below.


console.log(sum(2,3));   // Outputs 5
console.log(sum(2)(3));  // Outputs 5

Anonymous · Accepted Answer

function sum(x, y) {
  if (y !== undefined) {
    return x + y;
  } else {
    return function(y) { return x + y; };
  }
}

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