find type of var in node js code example

Example 1: get type of var js

function doSomething(x) {
  if(typeof(x) === 'string') {
    alert('x is a string')
  } else if(typeof(x) === 'number') {
    alert('x is a number')
  }
}

Example 2: node js check type of variable

if (typeof i != "number") {
    console.log('This is not number');
}