36 lines
880 B
Julia
36 lines
880 B
Julia
|
|
# A lambda function is made with an arrow from the arguments
|
|
# to the function body
|
|
f = x -> 2x^2
|
|
@show f(2)
|
|
|
|
# If the function takes more then one argument, parenthesis are required
|
|
g = (x, y) -> x * y
|
|
@show g(2, 3)
|
|
|
|
# This also holds for functions taking no arguments
|
|
p = () -> Float64(π)
|
|
@show p()
|
|
|
|
# Function currying is possible, so if anyone wants to do lambda calculus
|
|
# feel free.
|
|
h = x -> y -> x / y
|
|
@show h(12)(4)
|
|
|
|
# If a function has to be written over multiple lines, this can be done
|
|
# with a "begin" block.
|
|
fib = n -> begin
|
|
a, b = 0, 1
|
|
for i in 1 : n
|
|
a, b = b, a + b
|
|
end
|
|
a
|
|
end
|
|
@show fib.(0:6)
|
|
|
|
# Lambdas can be useful when passing a function as an argument
|
|
# without wanting to give it a name. Here is an example using a lambda
|
|
# instead of using the do-syntax for file handling
|
|
s = open(io -> String(read(io)), "test.txt", "r")
|
|
println(s)
|