Arrays

An array is a special type of variable that doesn’t store a single value; it stores a whole list of values.

let groceryList = [
    'Apples',
    'Hummus',
    'Cheese',
    'Chocolate',
];

Array Reference

To reference a single element in an array, use a numeric index reference inside of square brackets:

console.log(groceryList[0]); // outputs "Apples"

Note: indexes start at 0, so the first element is groceryList[0], the second is groceryList[1], etc.

Looping over Arrays

Arrays can be looped over, performing an action on each element:

for (let i = 0; i < groceryList.length; i++) {
    console.log(groceryList[i]);
}

for (item of groceryList) {
    console.log(item);
}

Additional ways of working with arrays are in Array Methods section.