Day 43 - Strings

README.md

@@ -49,4 +49,4 @@ Personal challenge to post every day a note about go.
 | 040 | [Task Queue](day40/)
 | 041 | [Type Assertion](day41/)
 | 042 | [Defer](day42/)
-Today 12/02/2017 i will not post code, because I'm travelling.Tomorrow I post 2days :beer:
+| 043 | [Strings](day43/)

day43/strings.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+)
+
+func main() {
+	// Fun with strings functions
+	// I choose 5 functions that looks funny
+
+	// Fields splits the string s around each instance of one or more consecutive white space characters, as defined by unicode.IsSpace, returning an array of substrings of s or an empty list if s contains only white space.
+	for _, word := range strings.Fields("a \n string\t with spaces") {
+		fmt.Printf("word = %+q\n", word)
+	}
+
+	// IndexAny returns the index of the first instance of any Unicode code point from chars in s, or -1 if no Unicode code point from chars is present in s.
+	// first vowel index
+	i := strings.IndexAny("some random content", "aeiou")
+	fmt.Printf("i = %+v\n", i)
+
+	// Join concatenates the elements of a to create a single string. The separator string sep is placed between elements in the resulting string.
+	phrase := strings.Join([]string{"an", "array", "of", "words"}, "  ")
+	fmt.Printf("phrase = %+v\n", phrase)
+
+	// Map returns a copy of the string s with all its characters modified according to the mapping function. If mapping returns a negative value, the character is dropped from the string with no replacement.
+	newString := strings.Map(func(original rune) rune {
+		return original + 300
+	}, "random string")
+	fmt.Printf("newString = %+v\n", newString)
+
+	// TrimSpace returns a slice of the string s, with all leading and trailing white space removed, as defined by Unicode.
+	fmt.Printf("%q\n", strings.TrimSpace(" \t\t  text with trash \n\t \r    \n"))
+
+	// for more, read the docs: https://golang.org/pkg/strings
+}