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Arithmetic Operators

Arithmetic Operators

Introduction

Arithmetic operators perform mathematical calculations on numeric values.

Visual Explanation

flowchart LR
    A["5 + 3 = 8"] --> Add[Addition]
    B["5 - 3 = 2"] --> Sub[Subtraction]
    C["5 * 3 = 15"] --> Mul[Multiplication]
    D["6 / 3 = 2"] --> Div[Division]
    E["5 % 2 = 1"] --> Mod[Modulus]
    F["2 ** 3 = 8"] --> Exp[Exponentiation]

Operators

let a = 10, b = 3;

a + b;  // 13 — addition
a - b;  // 7  — subtraction
a * b;  // 30 — multiplication
a / b;  // 3.3333 — division
a % b;  // 1  — modulus (remainder)
a ** b; // 1000 — exponentiation (ES7)

Increment & Decrement

let count = 5;

count++; // 5 (post-increment) → count = 6
++count; // 7 (pre-increment)
count--; // 7 (post-decrement) → count = 6
--count; // 5 (pre-decrement)

Operator Precedence

2 + 3 * 4;   // 14 — multiplication first
(2 + 3) * 4; // 20 — parentheses override

Summary

Arithmetic operators work with numbers
+ also concatenates strings
% gives remainder
** is for exponentiation (ES7)

Further Reading

MDN: Arithmetic Operators