FAQ: Code Challenges: JavaScript Fundamentals - truthyOrFalsy()

FAQ JavaScript FAQ
#52

Can you please tell me what I’m doing wrong with my code:

const truthyOrFalsy = value => {
  if (value === true) {
    return true;
  } else {
    return false;
  }
}

console.log(truthyOrFalsy(0));

I got this error message:

If an argument that evaluates to truthy is passed in to the function, the function should return true

#53 
const truthyOrFalsy = x => Boolean(x);
#54

This is one of those problems where a LOT of things work as a solution. But there is the one really really simple solution that solves all of the world’s problems…

const truthyOrFalsy = value => value ? true : false;

thinking about why this works is incredibly simple and also makes my brain hurt.

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#55

My solution:

const truthyOrFalsy = (value) => {

if (value)

{return true}

else {return false}

}

#56

Using logical operators…

const truthyOrFalsy = x => !! x;
#57

Hello,
Why when you type NaN as the name of the value you get a syntax error??

Untitled16
Untitled16866×190 17.5 KB
You should see false

#58

Can you show a screenshot of the error message, please? We’re not able to reproduce the error in sandbox.

#59

I’m not seeing what I’m missing. the code is giving me an error!

const truthyOrFalsy = (username, Stranger) => {
if (username) {
truthyOrFalsy = username;
} else {
truthyOrFalsy = ‘Stranger’

}
};

// Uncomment the line below when you’re ready to try out your function
console.log(truthyOrFalsy(0)) // Should p

#61

you can do it right even without the ternary operator

const truthyOrFalsy= num => {
if(num){
return true
}else {
return false
}
}

#63

can you please explain or rewrite the code, I don’t fully understand it! thank you

#64

The thing to do would be go back over all the previous lessons and look for tidbits that might have been missed the first time through.

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