Javascript return function meaning

Question

I understand return basically terminates a function. But somehow in this case, I'm not sure which return is actually finishing up a function.

var THRESHOLD = 12;
var v = [5, 2, 16, 4, 3, 18, 20];
var res;

res = v.some(function(element, index, array) {
  console.log('element:', element);
  if (element >= THRESHOLD) {
    return true; //#1
  }

  return false; // #2
});
console.log('res:', res);

Say it's iterating at v[0]=5, it skips if(){} and go ahead to return false //2, Why is that after #2 return, the function still keep looping?

sorry about multiple editting, it was really confusing expresion — MartianMartian
– MartianMartian, Commented May 4, 2015 at 17:58

rafaelc · Accepted Answer · 2015-05-04 17:56:36Z

5

The function does not keep running. It is being called several times because you are iterating over the array

answered May 4, 2015 at 17:56

rafaelc

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2 Comments

MartianMartian Over a year ago

but doesn't the return false stop the iteration?

CodingIntrigue Over a year ago

@XiaoQu No, otherwise how could it find your true value? From MDN: some() executes the callback function once for each element present in the array until it finds one where callback returns a true value. Returning true will stop the iteration though

julian · Accepted Answer · 2015-05-04 18:02:59Z

0

that happends because the 1st element is less than 10 and that 1st return false kill the loop.

answered May 4, 2015 at 18:02

julian

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