check if string has length javascript code example

Example 1: javascript if string empty

// Test whether strValue is empty or is None
if (strValue) {
    //do something
}
// Test wheter strValue is empty, but not None 
if (strValue === "") {
    //do something
}

Example 2: How to get length of string in javascript without using native length method

var str = userInput[0];
  var count = 0;
  while(str[count] !== undefined)
  {
      count += 1;
  }
  console.log(count)