Operators

Precedence Table

Arithmetic Operators

1 + 1 # 2
1 - 1 # 0
1 * 1 # 1
1 / 1 # 1
1 % 1 # 0

Comparison Operators

1 == 1 # true
1 != 1 # false
1 < 1 # false
1 <= 1 # true
1 > 1 # false
1 >= 1 # true

Logical Operators

true and false # false
true or false # true
not true # false

String Formatting Operator

The string formatting operator (fmt) is used to format a string. It takes a string, with expressions inside curly braces ({}).

name = "world"
print fmt"Hello, {name}!"

Apply Operator

The apply operator (.) is used to call a function on a value. It basically re-orders it's operands, so f.g(x) is equivalent to g(f, x). The parentheses are optional if the function takes only one argument.

fn plus_one num -> num + 1
print 1.plus_one # 2

fn add num1, num2 -> num1 + num2
print 1.add(2) # 3

Function Call Operator

The function call operator (()) is used to call a function. It has a comma-separated list of arguments inside the parentheses.

fn plus_one num -> num + 1
print plus_one(1) # 2

Index Operator

The index operator (:) is used to index a list or map.

a = [1, 2, 3]
print a:0 # 1
print a:1 # 2
print a:2 # 3

m = {
    foo -> 2, bar -> 4
    baz -> 6
}
print m:"foo" # 2

Map Index Operator

The map index operator (::) is used to index a map without quotes.

m = {
    foo -> 2, bar -> 4
    baz -> 6
}
print m::foo # 2