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What is the difference between “return” and “return value” in JavaScript?


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Both do exactly the same if and only if value===undefined. The following example demonstrates the differences.

function f1() { 
} // no return statement returns undefined. 
function f2() { 
} // returns undefined too.  The undefined is implicit here. 
function f3() { 
        return undefined; 
} // explicitly returns undefined 
function f4() { 
        return 1; 
} // returns 1.   
console.log('f1() === ' + f1()); // prints: f1() === undefined 
console.log('f2() === ' + f2()); // prints: f2() === undefined 
console.log('f3() === ' + f3()); // prints: f3() === undefined 
console.log('f4() === ' + f4()); // prints: f4() === 1


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