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--- wiki2:go_useful [2019/08/20 13:03]
alfred [Conversions]
+++ wiki2:go_useful [2020/05/09 09:25] (actual)
@@ Línea 19: / Línea 19: @@
-==== dep tool for managing dependences ====
+==== go mod for managing dependences ====
+After Go 1.11.
+<code>
+go mod init <project name>
+# Do not do it in the GOPATH
+</code>
+When you do ''go build'' it downloads dependencies automatically.
+There will appear ''go.mod'' y ''go.sum'' files. The first one to list dependences, the second one the checksums.
+<code>
+go mod tidy      # To remove non-used libraries
+go mod vendor    # To vendor dependencies in vendor directory.
+</code>
+Then, if you added a new package to your project, to use them:
+<code>
+import "project/package"
+</code>
+==== dep tool for managing dependences (DEPRECATED) ====
 To install: ''apt install go-dep''. To initialize a project:
@@ Línea 141: / Línea 161: @@
 <code>
 argumentsWithoutProgramName = os.Args[1:]
+settings_path = os.Getenv("GLOUDVIEWER_CONFIG")
 </code>
@@ Línea 149: / Línea 170: @@
 </code>
+===== Maps =====
+<code>
+var m map[string]Vertex
+m = make(map[string]Vertex)
+m["Bell Labs"] = Vertex{40.68433, -74.39967}
+</code>
+<code>
+keys := make([]keyType, 0, len(myMap))
+values := make([]valueType, 0, len(myMap))
+for k, v := range myMap {
+	keys = append(keys, k)
+	values = append(values, v)
+}
+</code>
 ===== Go Routines =====
 Previous code used:
@@ Línea 229: / Línea 266: @@
 // Join path
 path.Join(arguments[0], selectedProject)
+</code>
+====== Snippets ======
+===== Map, reduce, filter in Go =====
+<code>
+func mapXtoY(collection []X, fn func(elem X) Y) []Y {
+	var result []Y
+	for _, item := range collection {
+		result = append(result, fn(item))
+	}
+	return result
+}
+func reduceXtoY(collection []X, init Y, fn func(memo Y, elem X) Y) Y {
+	result := init
+	for _, item := range collection {
+		result = fn(result, item)
+	}
+	return result
+}
+func filterXs(collection []X, fn func(elem X) bool) []X {
+	var result []X
+	for _, item := range collection {
+		if fn(item) {
+			result = append(result, item)
+		}
+	}
+	return result
+}
 </code>
+===== Nested functions =====
+<code>
+func f() {
+    foo := func(s string) {
+        fmt.Println(s)
+    }
+    foo("Hello World!")
+}
+</code>

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