What is the purpose of the assignment operator in a programming language?

The assignment operator (= in most languages) is used to store a value in a variable or object property. It links an identifier (variable/property name) with a value.

Assignment can be simple or compound:

• Simple assignment: Assigns the value of the expression on the right to the variable on the left, overwriting the previous value.
• Compound assignment: Performs an arithmetic or bitwise operation on the variable's value and the expression's value, then assigns the result back to the same variable (e.g., +=, -=, *=, /=, %=, &=, |=, ^=, <<=, >>=). It simplifies notation: x += 5 is equivalent to x = x + 5.

Example in JavaScript:

let age = 30; // Simple assignment: assigns the number 30 to the variable age

age += 5; // Compound assignment: adds 5 to age (now age = 35)

const person = { name: "Alice" };
person.name = "Bob"; // Assigning to an object property