Method 1:

function multiply(x,y) {
     return (x * y);
}
console.log(multiply(4,2));
// Outputs: 8

Method 2:

var multiply = function(x,y) { return (x * y); }

console.log(multiply(2,4)); //output: 8

Method 3:

//The same function but with a self execution to set the value of the variable:
var multiply = function(x,y) {
     return (x * y);
}(4,2);
console.log(multiply);
//output: 8
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