Can you help me?

Question

I'm trying to run this code, but I don't know why my array don't save more than one element and my second button don't show anything, here's my code:
https://code.sololearn.com/W0anxyyqIIp3/?ref=app
Thanks a lot if you can tell me where is my mistake and if you can teach me :3

Answer 1

So its similar, just remove your arguments in the mostrar function

Since your array is a global variable you can access it inside the function.

Function mostrar(){
Alert(arr[0]);
}

Answer 2

You have two return statements in your js code, when you return, it ends the function, so everything after your return arr[control] isn't done

also, not too familiar with JS, but the control that you increment inside of your function shouldnt affect the control variable outside of your function so say

var control = 1;
control here won't change, because you are only passing the value of control, not a reference to the variable control

myfunc(var control){
control++
this control is a local variable that stops existing outside of the function.

}

look up passing arguments by reference in JS for more info. though changing values outside of the function from within a function is generally frowned upon
https://medium.com/nodesimplified/javascript-pass-by-value-and-pass-by-reference-in-javascript-fcf10305aa9c

Answer 3

https://code.sololearn.com/W4513bo4y2LE/?ref=app
So you dont need to pass control as an argument since its a global, and you can directly change it within the function

Answer 4

Jesús Emmanuel Justo González you don't need to pass any arguments or specify any parameter if you are already defining arr and control outside function in the global scope,

control value is 1 now ,and at index 1 of arr there is no value

Answer 5

You dont need it, what i was getting at is that the way your guardar function is written will not affect the variable control that exists outside of it, give me a sec and I'll try and help out a little more

Answer 6

Oh my God, thank you so much, now I finally can make my code works, thanks a lot :3 you're amazing Robert Atkins

Answer 7

Should I declare
myfunc (var control)
inside or outside the function guardar?

Answer 8

Thanks bro, now just a last question, Can I use the values of the array outside the function? Because (supposedly) I was wanting to save usernames and then show all of them using the function Mostrar, but only appears "undefined"

Answer 9

No problem, glad to help, probably could of done so a little better if I knew more about js :D