versioninfo()

function func1(x)
   sin(x) # return が無くても最後の式が返値になる
end

func1(x) = sin(x) # 同じシグネチャで再定義すると上書き可能

func2 = x -> sin(x)

func2 = func1

func2 = 1

func1 = x -> sin(x)

const func3 = x -> sin(x)

func2 = func3

println(x->x)

x->x

function test(a, other... ; opt1=0, options...)
    println("a=", a, ", other=", other)
    println("opt1=", opt1, ", options=", options)
end

test(1, 2, 3, 4; opt1=1, opt2=2, opt3=3)

test((1,2,3)...)

test([1,2,3]...)

test([1,2]...)

length((1,))

test(1;[(:opt1, 1), (:opt2, 2)]...)

test2(a::Int) = println("Int")

test2(s::String) = println("String")

test2(1)

test2("a")

test2(a::Number) = println("Number")

test2(1.0)

test2(1)

test2(a) = println("Any type")

test2(true)

test2([])

test2(1.0)

test2(1)

test2(a...) = println("Variable args of any type")

test2(1)

test2([])

test2(a::Array...) = print("Variable args of Array")

test2([])

test2(:symbol)

test2(a, b=false) = println("With omittable b")

test2(1)

test2(:symbol)

test3(a) = println("Any type")

test3(a; option=false) = println("Any type with option")

test3(1)

test3(a) = println("Any type")

test3(1)

test3(1, option=true)

test3(a; option2=false) = println("Any type with option2")

test3(1, option=true)

test3(1, option2=true)

test3(a; options...) = println("Any type with options")

test3(1, option2=true)

test3(a; option2=false) = println("Any type with option2")

test3(1, option2=true)

test3(1, option1=true)

test4(a) = "only a"
test4(a, b=false) = "with omittable b"

test4("which should be called?")

test4(a) = "only a"

test4("which should be called?")

test4(1, 2)