add doc for lambda

205-Lambda-expressions/lambda.gop

@@ -1 +1,21 @@
+//Go supports anonymous functions (lambdas). Lambda expressions are used when we want to define a function inline without giving it any name.
+//The way we declare a lambda depends on how we want to use it. It can be defined only, or defined and executed.
 
+//If we want a lambda to be defined without being executed, we only omit its identifier.
+func returnLambda() func(string) {
+	return func(msg string) {
+		println msg
+	}
+}
+
+
+
+//If we want the lambda to be defined and executed, we omit its identifier and add an argument list in parentheses after the body’s closing curly brace.
+func(msg string) {
+	println msg
+}("Hello")
+
+
+
+consoleLog := returnLambda()
+consoleLog "Hello"