For some reason I'm getting undefined and I don't know from where. Can you explain to me where this undefined comes from and how to ignore it?
This is my code
function memoize(cb) {
const memo = new Map();
return (...args) => {
const key = JSON.stringify(args);
if (!memo.has(key)) {
memo.set(key, cb(...args));
console.log("set cach");
}
console.log("use cach");
};
}
const callback = (...args) => args;
// const callback = (val) => val * 2;
const memoized = memoize(callback);
console.log(memoized(123)); // calls callback, returns 123
console.log(memoized(123)); // returns 123
console.log(memoized(123, "abc")); // calls callback, returns [123, 'abc']
console.log(memoized(123, "abc")); // returns [123, 'abc']
and this is the result
set cach
use cach
undefined
use cach
undefined
set cach
use cach
undefined
use cach
undefined
Thank you in advance.