Operators in Go
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We used some operators so far in our code examples, like =
, :=
and <
.
Let’s talk a bit more about them.
We have assignment operators =
and :=
we use to declare and initialize variables:
var a = 1
b := 1
We have comparison operators ==
and !=
that take 2 arguments and return a boolean
var num = 1
num == 1 //true
num != 1 //false
and <
, <=
, >
, >=
:
var num = 1
num > 1 //false
num >= 1 //true
num < 1 //false
num <= 1 //true
We have binary (require two arguments) arithmetic operators, like +
, -
, *
, /
, %
.
1 + 1 //2
1 - 1 //0
1 * 2 //2
2 / 2 //1
2 % 2 //0
+
can also join strings:
"a" + "b" //"ab"
We have unary operators ++
and --
to increment or decrement a number:
var num = 1
num++ // num == 2
num-- // num == 1
Note that unlike C or JavaScript we can’t prepend them to a number like
++num
. Also, the operation does not return any value.
We have boolean operators that help us with making decisions based on true
and false
values: &&
, ||
and !
true && true //true
true && false //false
true || false //true
false || false //false
!true //false
!false //true
Those are the main ones.
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