Szathmáry László honlapja @ DEIK

Like in Python.

if-elif-else
def test(n): if n < 0: print("negative") elif n == 0: print("zero") else: print("positive") def main(): test(-5) test(0) test(5)	proc test(n: int) = if n < 0: echo "negative" elif n == 0: echo "zero" else: echo "positive" proc main() = test(-5) test(0) test(5)

Output:

negative
zero
positive

The if expression

An if can be an expression too.

let n = 9

let status = if n < 0:
"negative"
elif n == 0:
"zero"
else:
"positive"

echo status # positive

Let's simplify it a bit:

let n = 9

let status = if n < 0:
"negative"
else:
"zero or positive"

echo status # zero or positive

It can be written in various ways. All these three variations are equivalent:

# v1
let n = 9

let status =
if n < 0:
"negative"
else:
"zero or positive"

# v2
let n = 9

let status = block:
if n < 0:
"negative"
else:
"zero or positive"

# v3
let n = 9

let status = if n < 0: "negative" else: "zero or positive"

echo status # zero or positive

𝥶This is the simplest form and this is how you can have a ternary operator in Nim :)