Suppose we have function, which returns 3 when passing 5 to it and return 5 when passing 3 to it. I know it is very easy with if else and switch.
for example
function countReturn(number){
if(number === 3){
return 5
}
if(number === 5){
return 3
}
}
But how can I implement the same logic without if else, switch or any built-in function?
You can store the return values in an array:
function countReturn(n) {
let a = [,,,5,,3];
return a[n];
}
That will return undefined for other inputs, just like your original code.
You could take the sum (3 + 5) and return the delta of the actual number.
function threeOrFive(value) {
return 8 - value;
}
console.log(threeOrFive(3)); // 5
console.log(threeOrFive(5)); // 3you can so it with ternary like this
return number === 3 ? 5 : (number === 5 ? 3 : 0);
Or you can do it with object
const obj = {
"5": 3,
"3": 5
};
return obj[number];