Data update

Task/Determine-if-a-string-is-numeric/Rust/determine-if-a-string-is-numeric-2.rust

@@ -0,0 +1,34 @@
+use std::str::FromStr;
+
+fn parsable<T: FromStr>(s: &str) -> bool {
+    s.parse::<T>().is_ok()
+}
+
+fn main() {
+    let test_cases = [
+        "142857",
+        "3.14",
+        "not of this earth!"
+    ];
+
+    let types: &[(&str, fn(&str) -> bool)] = &[
+        ("i32", parsable::<i32> as fn(&str) -> bool),
+        ("i64", parsable::<i32> as fn(&str) -> bool),
+        ("i128", parsable::<i32> as fn(&str) -> bool),
+
+        ("f64", parsable::<f64> as fn(&str) -> bool),
+    ];
+
+    println!("");
+    for &case in &test_cases {
+        for &(type_name, parse_fn) in types {
+            println!(
+                "'{}' {} be parsed as {}",
+                case,
+                if parse_fn(case) { "can" } else { "_cannot_" },
+                type_name
+            );
+        }
+        println!("");
+    }
+}