is-four

is-four

Check if a number is equal to 4.

Installation

Install the package using npm:

npm install is-four

Usage

The is-four package allows you to determine if a number (or other representations of "four") is equal to 4. It also provides methods to check for approximate equality or proximity to 4.

Basic Example

var isFour = require('is-four');

// Exact match
console.log(isFour(4).four()); // true
console.log(isFour(5).four()); // false

// Works with string representations of "four"
console.log(isFour("four").four()); // true
console.log(isFour("cuatro").four()); // true
console.log(isFour("IV").four()); // true

// Works with binary
console.log(isFour(0b100).four()); // true

roughly.four

// Rough equality
console.log(isFour(3.9).roughly.four()); // true
console.log(isFour(4.4).roughly.four()); // true
console.log(isFour(4.6).roughly.four()); // false

within(y).of.four

// Within 1 of 4
console.log(isFour(3).within(1).of.four()); // true
console.log(isFour(5).within(1).of.four()); // true
console.log(isFour(6).within(1).of.four()); // false

// Within 2 of 4
console.log(isFour(6).within(2).of.four()); // true
console.log(isFour(7).within(2).of.four()); // false

Test

npm test