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JavaScript JavaScript Basics Making Decisions in Your Code with Conditional Statements Test Multiple Conditions With the || Operator

Gennadii Chamorsov
Gennadii Chamorsov
9,207 Points
Posted by Gennadii Chamorsov
Gennadii Chamorsov
9,207 Points

Logical OR operator doesn't work with digits and words together in my code.

Please help me to find a mistake. I used the logical OR operator for this conditional statement: 

let correctGuessFingers = false;
const fingers = prompt('How many fingers has the human?');
if ( fingers === 20 || fingers === 'Twenty' ) {
  correctGuessFingers = true;
  console.log("it's true");
}

Only the answer 'Twenty' works but '20' doesn't. Thanks in advance.

4 Answers

Jonathan Hermansen
Jonathan Hermansen
25,935 Points
Jonathan Hermansen
Jonathan Hermansen
25,935 Points

You need to parse your fingers-variable before comparing it to a number. Now you compare a string to a number ("20" === 20), it will always return false.

Gennadii Chamorsov
Gennadii Chamorsov
9,207 Points
Gennadii Chamorsov
Gennadii Chamorsov
9,207 Points

Thanks for checking! I tried it this way: 

let correctGuessFingers = false;
let fingers = prompt('How many fingers has the human?');
if ( fingers === "20" || fingers === 'Twenty' ) {
  correctGuessFingers = true;
}

And still, doesn't work.

Jonathan Hermansen
Jonathan Hermansen
25,935 Points
Jonathan Hermansen
Jonathan Hermansen
25,935 Points

That should work.

Hussein Ammar
Hussein Ammar
11,106 Points
Hussein Ammar
Hussein Ammar
11,106 Points 
let correctGuessFingers = false;
let fingers = prompt('How many fingers has the human?');
if ( fingers === "20" || fingers === 'Twenty' ) {
  correctGuessFingers = true;
  console.log("thats true");
} else {
  console.log("Not true");
}

I tested your code and it should work!

Busra Tokuc
Busra Tokuc
7,444 Points
Busra Tokuc
Busra Tokuc
7,444 Points

The value returned by the prompt method is a string. So you should convert the string value to a number value before comparing them. You can do this by adding a plus symbol(Unary operators) just before the fingers variable. You can check unary operators on MDN. (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators#Unary_operators)

if ( +fingers === 20 || fingers === 'Twenty' ) {
  correctGuessFingers = true;
  console.log("it's true");
}