CODEWITHSUNDEEP
javascriptarraysfunction
Andrew Lopez
Andrew Lopez

Reputation: 13

How to return zero from a function with an empty parameter in javascript?

Write a function, multiply, that takes any number of arguments and multiplies them all together. If there is only one number, it will return that number.
If no numbers are passed in, it will return 0.

For example:

multiply() returns 0

multiply(1) returns 1

multiply(1, 2) returns 2

multiply(1, 2, 3) returns 6

multiply(1, 2, 3, 4) returns 24

function multiply(...a) {
  if (!a){
    return 0;
  } else if (a === Number){
    return a; 
  } else {
    return a.reduce((current, previous)=>{return previous*current});
  }
}

multiply(1,2,3);

Upvotes: 1

Views: 2375

Answers (1)

user3335966
user3335966

Reputation: 2745

After ... operation You will always have an array in this case, so You just must use:
if(!a.length){ instead of if(!a){;

Also, You don't need return in reduce() callback's arrow function in this case. You can change it on: 

(current, previous) => previous*current

Upvotes: 5

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