Operators
in operator
in allows to check whether an array or a map contains an element.
To do the opposite, use !in.
nums := [1, 2, 3]
println(1 in nums) // true
println(4 !in nums) // true
m := {
'one': 1
'two': 2
}
println('one' in m) // true
println('three' !in m) // true
It's also useful for writing boolean expressions that are clearer and more compact:
enum Token {
plus
minus
div
mult
}
struct Parser {
token Token
}
parser := Parser{}
if parser.token == .plus || parser.token == .minus || parser.token == .div {
// ...
}
if parser.token in [.plus, .minus, .div] {
// ...
}
V optimizes such expressions, so both if statements above produce the same machine code and no
arrays are created.
is and as operators
See how is and as operators work for
Sum types, for
Interfaces and for
Compile-time reflection.
Other operators
See Operators for more information about all operators.