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Arithmetic

Q: What does the modulus (%) operator do?

Answer: The modulus operator returns the remainder after a division. For example, 10 % 3 results in 1 because 3 goes into 10 three times with 1 left over..

Q: How do you calculate 2 to the power of 3 in modern JS?

Answer: You can use the exponentiation operator (**): 2 ** 3. Alternatively, you can use Math.pow(2, 3)..

Q: Which arithmetic operation has higher precedence: Addition or Multiplication?

Answer: Multiplication has higher precedence than addition. In the expression 5 + 2 * 3, the multiplication (2 * 3) happens first..

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Expert Answer & Key Takeaways

Mastering Arithmetic is essential for high-fidelity technical architecture and senior engineering roles in 2026.

JavaScript Arithmetic

Arithmetic operators perform arithmetic on numbers (literals or variables). Standard mathematical order (PEMDAS/BODMAS) applies to these calculations.

1. Basic Operators

Operator	Description
`+`	Addition
`-`	Subtraction
`*`	Multiplication
`**`	Exponentiation (ES2016)
`/`	Division
`%`	Modulus (Division Remainder)
`++`	Increment
`--`	Decrement

2. Modulus (Remainder)

The modulus operator (%) returns the division remainder.

let x = 5;
let y = 2;
let z = x % y; // z will be 1

3. Exponentiation

The exponentiation operator (**) raises the first operand to the power of the second operand.

let x = 5;
let z = x ** 2; // z will be 25

4. Increment and Decrement

The increment operator (++) increments numbers. The decrement operator (--) decrements numbers.

let x = 5;
x++;
let z = x; // z is 6

let y = 5;
y--;
let w = y; // w is 4

5. Operator Precedence

Operator precedence describes the order in which operations are performed in an arithmetic expression.

let x = 100 + 50 * 3;
// Multiplication has higher precedence, so it is (50 * 3) + 100 = 250

When using parentheses, the operations inside the parentheses are computed first:

let x = (100 + 50) * 3; // (150) * 3 = 450

Always use parentheses when you want to be sure of the calculation order. It also makes the code easier to read for other developers.

Arithmetic

Expert Answer & Key Takeaways

JavaScript Arithmetic

1. Basic Operators

2. Modulus (Remainder)

3. Exponentiation

4. Increment and Decrement

5. Operator Precedence

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Arithmetic

Expert Answer & Key Takeaways

JavaScript Arithmetic

1. Basic Operators

2. Modulus (Remainder)

3. Exponentiation

4. Increment and Decrement

5. Operator Precedence

Top Interview Questions

?Interview Question

?Interview Question

?Interview Question

Course4All Engineering Team

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Assignment

Conditional (If-Else)

Switch Statement

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