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For example if two integers A and B are given. Integer A occurs in Integer B at position P then the leftmost position should be returned.

For example,

about 4 years ago · Juan Pablo Isaza

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Accepted Answer · 2022-08-31T08:13:53.483Z

Convert to a string and use indexOf:

function getIndex(num1, num2){
  return String(num1).indexOf(String(num2));
}

console.log(getIndex(1953786, 53))

Alternatively:

function getIndex(num1, num2){
  return "".indexOf.call(num1, num2)
}

console.log(getIndex(1953786, 53))