The JavaScript Interview Handbook: 100+ Interview Questions/

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Solution Review: Array or Not?

Solution Review: Array or Not?

This lesson will explain the solution to the problem in the previous lesson.

We'll cover the following...

Solution #

Javascript (babel-node)
function check(obj) {
  if (Object.prototype.toString.call(obj) === "[object Array]") {
    return true;
  } else {
    return false;
  }
}
console.log(check(123));
console.log(check("cat"));
console.log(check([1, 2, 3, 4]));

Explanation #

To check whether the passed in object ...