Is it possible to assign a value to a function parameter inside a function before calling it?

Question

Javascript, functions parameters

Answer 1

If you're talking about default function parameter you could do something like this

function multiply(a, b = 1) {
return a * b;
}

when you call the function like this,

console.log(multiply(6, 5));

It'll output 30

But if you call the function without specifying the b parameter with value, JS will use the default value that you have set for the function, in our case 1.so

console.log(multiply(5));

Would print out 5

It'll use back the default parameter value that you've set for the multiply function

Hope this help

Answer 2

yes, it is used to have a default parameter.
in 99% of cases your parameter(s) which is(/are) optional (/has an default) should be at the end of the paramterlist

Answer 3

Thanks leon i understand now