Store lists of values.
✍️ 3 exercises + code challenge in this lessonAn array stores an ordered list of values in one variable: const fruits = ["Mango", "Apple", "Banana"];
fruits[0].length gives the number of elements.Array.isArray(x) checks whether something is an array.Mastering JavaScript Arrays helps you write clean and reliable JavaScript code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.
<pre id="out"></pre>
<script>
const log = (...a) => document.getElementById("out").textContent += a.join(" ") + "\n";
const fruits = ["Mango", "Apple", "Banana"];
log("First:", fruits[0]);
log("Last:", fruits[fruits.length - 1]);
fruits[1] = "Orange";
log("After change:", fruits);
log("Count:", fruits.length);
const mixed = [42, "text", true, { city: "Lahore" }, [1, 2]];
log("Mixed:", JSON.stringify(mixed));
log(Array.isArray(fruits));
</script>Check what you learned in “JavaScript Arrays”.
Get the first element of the array.
const fruits = ["Mango", "Apple"]; log(fruits[ ]);
What is the index of the last element in an array of length 5?
Create an array with "red", "green", "blue" and log how many items it has.
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