JS

Question

Hi

Please look through my code. If there is a mistake let me know. Thanks in advance!

let color = 'green';

/*
red => 1
green => 2
black => 3
other cases => unknown
*/

//your code goes here
if (color == 'red') {
console.log('1');
} else if (color == 'green') {
console.log('2');
} else if (color == 'black') {
console.log('3');
} else {
console.log('Unknown!');
}

Answer 1

Add task requirement in post Description for better view of the problem.

Answer 2

Your code has no problem, however in JS, it is recommended to use === than == for equivalent comparison.

There would be bug that might be hard to find and debug in a more complex codes if you use == for equivalent comparison. E.g.

let i = 1;

if (i == '1') {
console.log('Thus will run');
}
if (i == '01') {
console.log('This also run!');
}
if (i == '0001') {
console.log('This run too!!');
}
if (i == '0x001') {
console.log('This run as well!!!');
}

https://code.sololearn.com/cBi0oxhWJWh1/?ref=app

JavaScript is different from other languages like C or Java, it does not require a data type to be declared, this makes it very risky to use uncheck equivalent comparison.

Other languages use == safely because of they have type check beforehand.

(I have been coding JavaScript codes for many years, I remember I never use ==, not even once for my projects)