Question on Parameters - Dice Game - Step 20

[raven1177]

Tell us what’s happening:

If I’m correct, parameters in a callback function are supposed to influence the statement but I dont see how it influences them or why do statements need them in the first place. Such as with this, how does the parameter influence the dice.textContent being assigned to diceValuesArr[index]?

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Challenge Information:

Learn Intermediate Algorithmic Thinking by Building a Dice Game - Step 20

freeCodeCamp.org

[llencses78]

Hello:)
The forEach method calls a function for each element in an array. It is like a for loop.

const items = ["item1", "item2", "item3"];
const copyItems = [];

// before
for (let i = 0; i < items.length; i++) {
  copyItems.push(items[i]);
}

// after
items.forEach((item) => {
  copyItems.push(item);
});

Another example:

<script>
let text = "";
const fruits = ["apple", "orange", "cherry"];
fruits.forEach(myFunction);

document.getElementById("demo").innerHTML = text;
 
function myFunction(item, index) {
  text += index + ": " + item + "<br>"; 
}
</script>

As in the second example you can see, forEach takes myFunction that has two parameters. This is equal to this:

listOfAllDice.forEach((dice, index) => {
dice.textContent = diceValuesArr[index];}

or other way :

listOfAllDice.forEach((myFunction);

function myFunction(dice, index) {
dice.textContent = diceValuesArr[index];}