Just another update

Task/Call-a-function/Go/call-a-function-1.go

@@ -0,0 +1,11 @@
+import (
+	"image"
+	"image/gif"
+	"io/ioutil"
+	"strings"
+	"unicode"
+)
+
+func f() (int, float64)  { return 0, 0 }
+func g(int, float64) int { return 0 }
+func h(string, ...int)   {}

Task/Call-a-function/Go/call-a-function-2.go

@@ -0,0 +1,9 @@
+	f()
+	g(1, 2.0)
+	// If f() is defined to return exactly the number and type of
+	// arguments that g() accepts than they can be used in place:
+	g(f())
+	// But only without other arguments, this won't compile:
+	//h("fail", f())
+	// But this will:
+	g(g(1, 2.0), 3.0)

Task/Call-a-function/Go/call-a-function-3.go

@@ -0,0 +1,8 @@
+	h("ex1")
+	h("ex2", 1, 2)
+	h("ex3", 1, 2, 3, 4)
+	// such functions can also be called by expanding a slice:
+	list := []int{1,2,3,4}
+	h("ex4", list...)
+	// but again, not mixed with other arguments, this won't compile:
+	//h("fail", 2, list...)

Task/Call-a-function/Go/call-a-function-4.go

@@ -0,0 +1 @@
+	gif.Encode(ioutil.Discard, image.Black, &gif.Options{NumColors: 16})

Task/Call-a-function/Go/call-a-function-5.go

@@ -0,0 +1 @@
+	if 2*g(1, 3.0)+4 > 0 {}

Task/Call-a-function/Go/call-a-function-6.go

@@ -0,0 +1,9 @@
+	fn := func(r rune) rune {
+		if unicode.IsSpace(r) {
+			return -1
+		}
+		return r
+	}
+	strings.Map(fn, "Spaces removed")
+	strings.Map(unicode.ToLower, "Test")
+	strings.Map(func(r rune) rune { return r + 1 }, "shift")

Task/Call-a-function/Go/call-a-function-7.go

@@ -0,0 +1,4 @@
+	a, b := f()              // multivalue return
+	_, c := f()              // only some of a multivalue return
+	d := g(a, c)             // single return value
+	e, i := g(d, b), g(d, 2) // multiple assignment

Task/Call-a-function/Go/call-a-function-8.go

@@ -0,0 +1,2 @@
+	list = append(list, a, d, e, i)
+	i = len(list)