Chapter VIII · Arrays
Reference vs Value
Primitives are stored and copied by value, whereas complex arrays and objects are handled by reference.
01 How It Works
Think of photocopying a text document (value) versus sharing a live shared Google Doc link (reference).
Primitive values duplicate directly, while reference values point to shared memory locations.
example.js
let a = 10;
let b = a; // Copied by value
b = 20;
console.log(a); // 10 (Independent)1. Understand primitive value duplication.
2. Observe reference pointer sharing for arrays/objects.
3. Use cloning techniques when isolation is required.
02 Practical Example
Here is how you might see this concept applied in real-world code:
practical.js
const arrA = [1, 2];
const arrB = arrA;
arrB.push(3); // Affects arrA tooKey Takeaway
Always account for reference sharing when manipulating arrays and objects.