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authorIndrajith K L2022-12-03 17:00:20 +0530
committerIndrajith K L2022-12-03 17:00:20 +0530
commitf5c4671bfbad96bf346bd7e9a21fc4317b4959df (patch)
tree2764fc62da58f2ba8da7ed341643fc359873142f /v_windows/v/examples/function_types.v
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Adds most of the toolsHEADmaster
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diff --git a/v_windows/v/examples/function_types.v b/v_windows/v/examples/function_types.v
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+// Function signatures can be declared as types:
+
+type Filter = fn (string) string
+
+// Functions can accept function types as arguments:
+
+fn filter(s string, f Filter) string {
+ return f(s)
+}
+
+// Declare a function with a matching signature:
+
+fn uppercase(s string) string {
+ return s.to_upper()
+}
+
+fn main() {
+ // A function can be assigned to a matching type:
+
+ my_filter := Filter(uppercase)
+
+ // You don't strictly need the `Filter` cast - it's only used
+ // here to illustrate how these types are compatible.
+
+ // All of the following prints "HELLO WORLD":
+
+ println(filter('Hello world', my_filter))
+ println(filter('Hello world', uppercase))
+ println(filter('Hello world', fn (s string) string {
+ return s.to_upper()
+ }))
+}