CODEWITHSUNDEEP
javascriptjquery
KiRa
KiRa

Reputation: 924

How does the second function get a data?

How does the start and history gets a value?. Where it came from?. I am reading this LINK.

If anyone knows please explain it.

Output

(((1 * 3) + 5) * 3)

function findSolution(target) {
  function find(start, history) {
    if (start == target)
      return history;
    else if (start > target)
      return null;
    else
      return find(start + 5, "(" + history + " + 5)") ||
             find(start * 3, "(" + history + " * 3)");
  }
  return find(1, "1");
}

console.log(findSolution(24));

Upvotes: 0

Views: 35

Answers (1)

autistic
autistic

Reputation: 15642

function findSolution(target) {
  function find(start, history) {     // <--- NOTICE DECLARATIONS HERE
      /* SNIP */
      return find(start + 5, "(" + history + " + 5)") ||
             find(start * 3, "(" + history + " * 3)");
  }       //    ^--- FUNCTION CALLS HERE
  return find(1, "1");  // <--- AND HERE
}

console.log(findSolution(24));

I've snipped out some irrelevant details to this question and inserted some comments. As you can see, the function find is declared with the two arguments in question start and history. find is first called with 1 as the value for start and "1" as the value for history. Following this, the find function recursively calls itself with new values for these arguments.

Upvotes: 2

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