[Solved] JavaScript IndexOf with heterogeneous array [closed]

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Why 5 is missing ?

console.log(5 === "5")

indexOf(5) isn’t -1 because 5 and "5" are two different value ( indexOf uses strict equality ) MDN indexOf

console.log([5].indexOf(5))
console.log(["5"].indexOf(5))

How can i match both 5 or "5" ?

Check for both numeric and string value.

var myArray = ["2", "3", 5]
var found = [];
var range = 10;

for (var i = 1; i < range; i++) {
  if (myArray.indexOf(i) === -1 && myArray.indexOf(String(i)) === -1) {
    found.push(i);
  }
}

console.log(found)

solved JavaScript IndexOf with heterogeneous array [closed]