Comparison operators

Operators explained

Here are the most common comparison operators in javascript:

Usage	Description
a > b	Is a bigger than b?
a >= b	Is a bigger than or equal to b?
a < b	Is a smaller than b?
a <= b	Is a smaller than or equal to b?
a === b	Is a strictly equal to b? (same value and type)
a == b	Is a loosely equal to b ?

TIP

As a general rule, prefer === unless you know you need ==.

Examples

Using inequalities

js

const minimumAge = 18
let userAge = 21
console.log(userAge >= minimumAge)

output

true

Using equality operators

js

const bookCondition = 'good'

console.log(bookCondition === 'poor')
console.log(bookCondition === 'good')

output

false
true

Strict and loose equality

As we mentioned, == and === have different behaviour.

js

let userId = '123'
let inputId = 123

// loose equality check
console.log(userId == inputId)

// strict equality check
console.log(userId === inputID)

output

true
false