What Is An Expression In Programming?

An expression is any valid unit of code that resolves to a value. It can be a combination of variables, literals, operators, and function calls that produce a single value.

Here are some types of expressions in JavaScript [↗]:

1. Arithmetic Expressions: Involving mathematical operations like addition, subtraction, multiplication, division, etc.

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   01: let result = 10 * (5 + 3); // Arithmetic expression

2. Logical Expressions: Involving logical operations using logical operators such as && (AND), || (OR), ! (NOT), etc.

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   01: let isTrue = (true && false); // Logical expression

3. String Concatenation: Combining strings using the + operator.

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   01: let fullName = "John" + " " + "Doe"; // String concatenation expression

4. Function Calls: Invoking functions that return values.

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   01: let randomNumber = Math.random(); // Function call expression

5. Assignment Expressions: Assigning values to variables using the = operator.

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   01: let x = 10; // Assignment expression

6. Ternary Expressions (Conditional Operator): Using the conditional operator ? : for conditional expressions.

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   01: let age = 20;
   02: let message = (age >= 18) ? "Adult": "Minor"; // Conditional expression

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