Wiki: Julia

Check CGSE Julia golfing tips


Julia syntax is flexible enough to allow different programming styles. A simple task as printing the numbers from 1 to 10 each on a new line can be written in several ways.

The classic imperative style reads

# 29 bytes
for i=1:10

This can be easily golfed by removing all the indentation

# 24 bytes
for i=1:10;println(i)end

Note that no space is required between the closing bracket and end.

Julia supports list comprehension as well, therefore we may write also

# 23 bytes
[println(i) for i=1:10]

A more functional approach would use map as

# 23 bytes

where -> is used to define an anonymous function. The previous can be even shorter:

# 20 bytes

However, julia really shines when we start broadcasting functions over arrays. Every function can be applied to all the elements of an array by postpending a ., hence

# 14 bytes


You can use the broadcast operator + pipe operator to save parentheses. (x->x^2+1).([1,2,3]) => [1,2,3].|>x->x^2+1

Comparison chaining

Julia supports comparison chaining like Python, so this also means you can sometimes save a character by replacing && with or similar:

x>0&&println(x) # 15 chars, 15 bytes
x>0≠println(x) # 14 chars, 16 bytes

Symbols instead of string literals

Using a symbol instead of a string literal can save one byte: