Javascript Comparisons

In this chapter we will learn about Comparison.

As we have told, the Comparisons are operators for determine equality or difference between variables or values.

I'm sure you have seen a thing like this. For example y = 10. This operator is not comparison. It's for setting value to a given variable.

Let's look at the table, to know which type of comparisons there are.

Operator	Description	Comparing	Returns
==	equal to	x == 8 x == 5	false true
===	equal value and equal type	x === "5" x === 5	false true
!=	not equal	x != 8	true
!==	not equal value or not equal type	x !== "5" x !== 5	true false
>	greater than	x > 8	false
<	less than	x < 8	true
>=	greater than or equal to	x >= 8	false
<=	less than or equal to	x <= 8	true

How to use it?

The Comparison is used to compare any values and do something depending on the result.

if (speed > 120){
       variable = "Is very fast";
}

Logical operators are operators to determine a logic of 2 values. Let's set values to the variables: x = 10, y = -8.

There are 3 Logical operators.

Conditional Operator is very useful syntax for programmer. It's very correct code style.

variableName = condition ? value1 : value2 
// value1, when condition is true, value2 when condition is false

var name = girl ? 'Ani' : 'Tigran';

As you know the programming is based on {0,1} and every programming language has operators to work with bits. Javascript has these operators too.

Operator	Description	Example	Same as	Result	Decimal
&	AND	x = 5 & 1	0101 & 0001	0001	1
\|	OR	x = 5 \| 1	0101 \| 0001	0101	5
~	NOT	x = ~ 5	~0101	1010	10
^	XOR	x = 5 ^ 1	0101 ^ 0001	0100	4
<<	Left shift	x = 5 << 1	0101 << 1	1010	10
>>	Right shift	x = 5 >> 1	0101 >> 1	0010	2