ES6 - Complete a Promise with resolve and reject

JavaScript
1

i passed this code but i dont understand this. It says (If responseFromServer is true) shouldnt the code be if(responseFromServer === true) { ? if not please explain im a lil confused
Your code so far

const makeServerRequest = new Promise((resolve, reject) => {
  // responseFromServer represents a response from a server
  let responseFromServer;
    
  if(responseFromServer) {
   resolve("We got the data") // Change this line
  } else {  
    reject("Data not received")// Change this line
  }
});

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Challenge: ES6 - Complete a Promise with resolve and reject

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2

In this case

if(responseFromServer) {

and

if(responseFromServer === true) {

are functionally equivalent.

The if does not test if something is true or false, it checks if they are truthy or falsy. In JS, the falsy values are undefined, null, 0, -0, 0n, NaN, false, and an empty string. Everything else is truthy.

Since the value tested is boolean, JS knows that do the “if” if the value is true and to do the “else” otherwise.

Does that makes sense?

1 Like
3

There may be some cases where you explicitly want to test === true - like if you are not 100% confident that it is boolean - but most of the time, a truthy check is sufficient.

4

it does, thank your for making it more simple ^.^

1 Like
5

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