Remove collection-functions

Now that we have generics, this example is not relevant.

Updates #349

examples.txt

@@ -45,7 +45,6 @@ Sorting by Functions
 Panic
 Defer
 Recover
-Collection Functions
 String Functions
 String Formatting
 Text Templates

examples/collection-functions/collection-functions.go

@@ -1,113 +0,0 @@
-// We often need our programs to perform operations on
-// collections of data, like selecting all items that
-// satisfy a given predicate or mapping all items to a new
-// collection with a custom function.
-
-// In some languages it's idiomatic to use [generic](http://en.wikipedia.org/wiki/Generic_programming)
-// data structures and algorithms. Go does not support
-// generics; in Go it's common to provide collection
-// functions if and when they are specifically needed for
-// your program and data types.
-
-// Here are some example collection functions for slices
-// of `strings`. You can use these examples to build your
-// own functions. Note that in some cases it may be
-// clearest to just inline the collection-manipulating
-// code directly, instead of creating and calling a
-// helper function.
-
-package main
-
-import (
-	"fmt"
-	"strings"
-)
-
-// Index returns the first index of the target string `t`, or
-// -1 if no match is found.
-func Index(vs []string, t string) int {
-	for i, v := range vs {
-		if v == t {
-			return i
-		}
-	}
-	return -1
-}
-
-// Include returns `true` if the target string t is in the
-// slice.
-func Include(vs []string, t string) bool {
-	return Index(vs, t) >= 0
-}
-
-// Any returns `true` if one of the strings in the slice
-// satisfies the predicate `f`.
-func Any(vs []string, f func(string) bool) bool {
-	for _, v := range vs {
-		if f(v) {
-			return true
-		}
-	}
-	return false
-}
-
-// All returns `true` if all of the strings in the slice
-// satisfy the predicate `f`.
-func All(vs []string, f func(string) bool) bool {
-	for _, v := range vs {
-		if !f(v) {
-			return false
-		}
-	}
-	return true
-}
-
-// Filter returns a new slice containing all strings in the
-// slice that satisfy the predicate `f`.
-func Filter(vs []string, f func(string) bool) []string {
-	vsf := make([]string, 0)
-	for _, v := range vs {
-		if f(v) {
-			vsf = append(vsf, v)
-		}
-	}
-	return vsf
-}
-
-// Map returns a new slice containing the results of applying
-// the function `f` to each string in the original slice.
-func Map(vs []string, f func(string) string) []string {
-	vsm := make([]string, len(vs))
-	for i, v := range vs {
-		vsm[i] = f(v)
-	}
-	return vsm
-}
-
-func main() {
-
-	// Here we try out our various collection functions.
-	var strs = []string{"peach", "apple", "pear", "plum"}
-
-	fmt.Println(Index(strs, "pear"))
-
-	fmt.Println(Include(strs, "grape"))
-
-	fmt.Println(Any(strs, func(v string) bool {
-		return strings.HasPrefix(v, "p")
-	}))
-
-	fmt.Println(All(strs, func(v string) bool {
-		return strings.HasPrefix(v, "p")
-	}))
-
-	fmt.Println(Filter(strs, func(v string) bool {
-		return strings.Contains(v, "e")
-	}))
-
-	// The above examples all used anonymous functions,
-	// but you can also use named functions of the correct
-	// type.
-	fmt.Println(Map(strs, strings.ToUpper))
-
-}

examples/collection-functions/collection-functions.hash

@@ -1,2 +0,0 @@
-002b2ee17f1111c7607a7b7742753af1b5a3c8c1
-uKnePZM91WV

examples/collection-functions/collection-functions.sh

@@ -1,7 +0,0 @@
-$ go run collection-functions.go 
-2
-false
-true
-false
-[peach apple pear]
-[PEACH APPLE PEAR PLUM]

public/index.html

@@ -121,8 +121,6 @@
       
         <li><a href="recover">Recover</a></li>
       
-        <li><a href="collection-functions">Collection Functions</a></li>
-      
         <li><a href="string-functions">String Functions</a></li>
       
         <li><a href="string-formatting">String Formatting</a></li>

public/recover

@@ -14,7 +14,7 @@
           
           
           if (e.key == "ArrowRight") {
-              window.location.href = 'collection-functions';
+              window.location.href = 'string-functions';
           }
           
       }
@@ -180,7 +180,7 @@ panic and resumes in the deferred closure.</p>
       
       
       <p class="next">
-        Next example: <a href="collection-functions">Collection Functions</a>.
+        Next example: <a href="string-functions">String Functions</a>.
       </p>
       
 

public/string-functions

@@ -9,7 +9,7 @@
       onkeydown = (e) => {
           
           if (e.key == "ArrowLeft") {
-              window.location.href = 'collection-functions';
+              window.location.href = 'recover';
           }