How to change value of an array element through javascript?

arrays, javascript

Solution

function uClicked(){ // remove the parameter.

The parameter isn't needed, and is hiding the real `fer` variable.

Because `fer` was declared in outer scope, `uClicked` function can access it.

Fixed code:

var fer=[];

for (i=0; i< 15; i++){
        fer[i]=i+1;
}

function uClicked(){
    fer[12] = 10; 
    alert(fer[12]);
}

Problem

I want to make a button that changes the value of an element in an array. I am trying to do it by the following code but the element does not change. As a self learning beginner, I am probably missing something very obvious and I would appreciate if someone can point that out to me. Thank you for your answers! ``` <!DOCTYPE HTML> <html> <head> <meta charset="utf-8"> <title>Change Array Value</title> </head> <body> <textarea id="log2"></textarea> <input type="button" onClick="uClicked();" value="Click!"> <script> var fer=[]; for (i=0; i< 15; i++){ fer[i]=i+1; } function uClicked(fer){ fer[12] = 10; return fer[12]; } log2.value = "fer[12]= " + fer[12]; </script> </body> </html> ```

Original source