JavaScript basics comparison operators

β€” 5 minute read

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In this article on JavaScript basics, we'll be looking at comparison operators. These operators can be used to compare two values returning a boolean (true or false).

These are super handy for decision-making. Let's see which ones we can use:

OperatorComparisonExample
==Equal to8==8 // true
5==8 // false
'5'==5 // true
'f'=='f' // true
!=Not equal to8!=8 // false
5!=8 // true
'5'!=5 // false
'f'!='f' // false
===Strict equal to8===8 // true
'5'===5 // false
'f'==='f' // true
!==Strict not equal to8!==8 // false
'5'!==5 // true
'f'!=='f' // false
>Greater than5>8 // false
8>5 // true
5>5 // false
<Less than5<8 // true
8<5 // false
5<5 // false
>=Greater than or equal to5>=8 // false
8>=5 // true
5>=5 // true
<=Less than or equal to5<=8 // true
8<=5 // false
5<=5 // true

JavaScript equal to operator permalink

This operator is used to evaluate two values. However, they don't have to be of the same type. Meaning we can assess if a string is equal to a number!

`5` == 5; // true
5 == 5; // true

But it can also compare strings for instance:

'string' == 'string'; // true
'String' == 'string'; // false

Note: It's capital sensitive, as you can see above!

JavaScript not equal to operator permalink

Following this is the not equal to operator, which can evaluate if a comparison is not correct.

5 != 5; // false
8 != 5; // true
'8' != 5; // true
'String' != 'string'; // true
'string' != 'string'; // false

JavaScript strict operators permalink

Then we have these two as strict versions, which should be preferred over the top ones. What this means is that it will check against the type as well.

5 === 5; // true
'5' === 5; // false

And the same works for the not equal to strict comparison.

5 !== 5; // false
8 !== 5; // true
'8' !== 5; // true

Read more about == vs === in JavaScript.

JavaScript Greater and Less then permalink

Then we have the greater than and less than operators. These can be used to assess if a value is greater or less than the compared one.

Generally, these should only be used with number values.

8 > 5; // true
8 < 5; // false
5 > 8; // false
5 < 8; // true
5 > 5; // false

JavaScript greater/less or equal to permalink

We can also use the above two comparisons to check whether something hits a threshold.

We want to evaluate if a value is greater than or equal to a certain number?

5 >= 5; // true
8 >= 5; // true

Meaning our number is greater than or equal to 5, which is the case in the above example.

This can also be used for checking less than operations.

5 <= 5; // true
3 <= 5; // true

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