const num = () => console.log("Hello") || "world!";
let result = num();
console.log(result);output:
Hello
world
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3console.log returned none, so num returns 'world' so thats why ur code prints hello world – Ghost Ops Dec 18 '21 at 14:10
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1`console.log` always returns `undefined` so `||` will then evaluate the right side, which is "world". – trincot Dec 18 '21 at 14:10