Add script example.

scripts/function_decl5.rhai

@@ -0,0 +1,35 @@
+//! This script defines multiple versions of the same function
+//! for use as method with different data types.
+
+// For strings
+fn string.calc(x) {
+    this.len + x
+}
+// For integers
+fn int.calc(x) {
+    this * x
+}
+// For booleans
+fn bool.calc(x) {
+    if this { x } else { 0}
+}
+// For arrays
+fn array.calc(x) {
+    this.len + x
+}
+// For object maps
+fn map.calc(x) {
+    this[x]
+}
+// Catch-all
+fn calc(x) {
+    `${this}: ${x}`
+}
+
+print("hello".calc(42));                // 47
+print(42.calc(42));                     // 1764
+print(true.calc(42));                   // 42
+print(false.calc(42));                  // 0
+print([1,2,3].calc(42));                // 45
+print(#{"a": 1, "b": 2}.calc("b"));     // 2
+print('x'.calc(42));                    // x: 42