Numbers in Node.js

Master numeric operations in JavaScript: creation, validation, math utilities, rounding, random numbers, powers, roots, and conversions.

Creating Numbers

JavaScript uses the Number type for most numeric values, but also provides typed arrays for low-level control.

1. Creating a Normal Number

Numbers can be integers or floating-point.

2. Creating a 1-Byte Numeric Variable

Use Uint8Array to store a 1-byte unsigned integer.

Finding Min and Max

JavaScript provides Math.min() and Math.max().

1. Finding Minimum

Use Math.min().

2. Finding Maximum

Use Math.max().

Rounding Numbers

JavaScript provides multiple rounding utilities.

1. Rounding to Integer

Use Math.round().

2. Rounding to N Decimal Places

Use toFixed() or math scaling.

Floor and Ceiling

Floor and ceiling are commonly used in pagination and ranges.

1. Floor of a Number

Use Math.floor().

2. Ceiling of a Number

Use Math.ceil().

Random Numbers

JavaScript provides Math.random().

1. Random Number from 0 to 1

Includes 0, excludes 1.

2. Random Integer from a to b

Use scaling with Math.floor().

Powers and Roots

JavaScript supports exponentiation directly.

1. Finding a^b

Use ** or Math.pow().

2. Finding Nth Root

Use Math.pow().

Number ↔ String Conversion

Conversions are common in input and output handling.

1. Converting Number to String

Use String() or toString().

2. Converting String to Number

Use Number(), parseInt(), or parseFloat().

Validating Numbers

NaN handling is critical in real applications.

1. Checking if a Numeric String is Valid

Use Number.isNaN().