What do expressions do in JavaScript?

Expressions in JavaScript are fragments of code that are evaluated to obtain a value. They can be simple (literals) or complex (operations with variables and functions).

Examples of expressions:

• Assigning a value to a variable (let x = 5;)
• Mathematical operations (a + b)
• Function calls (myFunction())
• Logical operations (true && false)
• Accessing object properties (obj.property)
• Creating literals ("string", [1, 2], { key: 'value' })

Expressions are often used inside operators, for example, in conditional statements (if (expression)) or loops (while (expression)).

// Examples of expressions
let a = 10; // Assignment expression
let b = a * 2; // Multiplication expression
let result = Math.max(a, b); // Function call expression