Rho Programming Language

Rho is a lightweight, dynamically typed programming language written in C. The language is largely inspired by Python, both in terms of syntax and implementation (CPython, to be exact).

Examples

"hello world"

# simple "hello world" program
print 'hello world'

Arithmetic

print ((50 - 5*6)/4)**2  # prints 25

if statements

b = 1
if b {
    print "b is non-zero!"  # strings can be delimited by either " or '
} else {
    print "b is zero!"
}

while statements

# print integers from 1 to 9:
a = 1
while a < 10 {
    print a
    a += 1
}

for statements

# equivalent of while-loop above:
for a in 1..10:  # ':' can be used for single-statement blocks
    print a

Functions

# factorial function
def fact(n) {
    if n < 2 { return 1 } else { return n * fact(n - 1) }
}

# hypotenuse function
def hypot(a, b) {
    # functions can be nested:
    def square(x) {
        return x**2
    }

    # functions can be anonymous:
    sqrt = (: $1 ** 0.5)

    return sqrt(square(a) + square(b))
}