Coding Challenge #13

Edabit: Return the sum of two numbers

// from the 'Very Easy' page:
simple_sum = (a,b)=>{return a+b};

Now let's take it up one notch by returning a new function that hard-codedly adds the two arguments.

This is just for fun to explore some more of JavaScript.

function make_adder(a,b){
    var fnStr = "function adder(){return " + a + " + " + b + "}";
    window.eval(fnStr);
    try{
        console.log('Using created function, ' + a + ' + ' + b + ' = ' + window['adder']());
    }catch{
        console.log('failed to call function');
    }
}
make_adder(1,2) // expecting 3
make_adder(1,20) // 21
make_adder(13,17) // 30
make_adder(99,1) // 100

interestingly, just eval(fnStr) doesn't work ( i guess because of the function's scope?), but window.eval(fnStr) works as expected.