How to make function parameter constant in JavaScript?

Question

What I want to do is to use as many immutable variables as possible, thus reducing the number of moving parts in my code. I want to use \"var\" and \"let\" only when it\'s n

Answer 1

function wrapper(i){
    const C=i
    return new Function("a","b", "return a+b+"+C)    
}

f100 = wrapper(100) //ƒ anonymous(a,b/*``*/) {return a+b+100} 
f100(1,2) //OUTPUT 103

f200 = wrapper(200) //ƒ anonymous(a,b/*``*/) {return a+b+200} 
f200(1,2) //OUTPUT 203