Nice one, although it required more typing. The obvious solution required none at all.:)

Wow, this is clean

niceeeeee Kata.
Your Kata was so gnarly :) , that I wanted to create similar Kata with template literals. Check me out!

Same as mine :p

i forgot about it

Nice!

Деклоративность)))

Блин, так лаконично!

Как все просто! Емае

Clever... Can anyone explain it to me!

Not to change the code... just to debug!

I like this solution, inspired me to use interpulationa in ec6, also called template literals.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals

Thank you so much! This was incredibly helpful. I really appreciate you giving me such a thorough and detailed explanation. I totally understand now.

Your code does not work as intended becasue of the so-called 'operator precedence'. This determines the order in which the operators are evaluated. For example the multiplication operator '*' has a higher precendence that the '+' operator. This means that the following operation,
  1 + 2 * 3
equals 7 and not 9.

Now, in your code,

function greet(name){
  return "Hello, " + name === "Johnny" ? "my love!" : name + "!";
}

'+' has higher precedence than the '===' which has a higher precedence than the conditional statement '… ? … : …'
This means that the code will be evaluated as:

function greet(name) {
  if ("Hello, " + name === "Johnny") {    //  Concatenate first and after this check if the result equals to "Johnny".
    return "my love!";
  } else {
    return name + "!"    //  'Johnny!' is returned
  }
}

In order to avoid this, we have used the parentheses to create the grouping operator '(...)' which has the highest precedence in JavaScript.

You can check the operator precedence here: https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Operators/Operator_Precedence

I also recommend this short article with examples: http://blog.stchur.com/2006/07/14/the-javascript-ternary-operator/

Please up-vote my answer if it helped you. Thank you :)