Loops

NBCL has two types of loops: for loop for iterating over a known sequence, and the while loop for repeating until condition is not truthy.

For Loops

for loops can iterate over a range or list.

Range

Ranges come in two forms: exclusive (..) and inclusive (..=):

nbl

# Exclusive goes from 1 to the
# number before 5 (which is 4).
for i in 1..5 {
    print(i)
}

output

1
2
3
4

nbl

# Inclusive goes from 1 to 5.
for i in 1..=5 {
    print(i)
}

output

1
2
3
4

List

You can also iterate over a list directly, or a variable holding one:

for i in [1, 2, 3, 4] {
    print(i)
}

# You can loop in variables too
local example = [2, 3, 5, 1]
for i in example {
    print(i)
}

To get both the index and value, destructure with (idx, value):

# idx is 0-based
for (idx, num) in [3, 5, 1] {
    print(idx)
    print(num)
}

While Loops

while repeats its body as long as the condition holds:

local x = true
# Runs as long as x is true
while x {
    print("x is true")
}

This example shows how a while loop can be used to repeate its body until x is less than or equal to 10.

local x = 0
while x <= 10 {
    print(x)
    set x += 1
}