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How can I return the index position of "needle" in this array? 

function findNeedle(haystack) {
  return findNeedle.indexOf('needle');
}

findNeedle(['3', '123124234', undefined, 'needle', 'world', 'hay', 2, '3', true, false]);

How can I return the index position of "needle" in this array? 

function findNeedle(haystack) {
  return findNeedle.indexOf('needle');
}

findNeedle(['3', '123124234', undefined, 'needle', 'world', 'hay', 2, '3', true, false]);

  • javascript
Share Improve this question edited Jun 22, 2016 at 7:28 Quentin Roy 7,8972 gold badges34 silver badges52 bronze badges asked Jun 22, 2016 at 7:20 Dimitris XydasDimitris Xydas 2332 gold badges5 silver badges9 bronze badges
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3 Answers 3

Reset to default 3

make it

return haystack.indexOf('needle');

you need to use the argument you have passed to the function instead of the function itself.

findNeedle is the function, not the array that is passed as an argument of the function. Inside the function, haystack is your array.

function findNeedle(haystack) {
  return haystack.indexOf('needle');
}

var result = findNeedle(['3', '123124234', undefined, 'needle', 'world', 'hay', 2, '3', true, false]);

console.log(result);

You shoudn't run method .indexOf() on function. Call it on your property haystack instead.

return haystack.indexOf('needle');

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