September 2017 Update

Task/Create-a-two-dimensional-array-at-runtime/Rust/create-a-two-dimensional-array-at-runtime.rust

@@ -0,0 +1,28 @@
+use std::env;
+fn main() {
+    let mut args = env::args().skip(1).flat_map(|num| num.parse());
+    let rows = args.next().expect("Expected number of rows as first argument");
+    let cols = args.next().expect("Expected number of columns as second argument");
+
+    assert!(rows != 0 && cols != 0);
+
+    // Creates a vector of vectors with all elements initialized to 0.
+    let mut v = init_vec(rows, || init_vec(cols, || 0));
+    v[0][0] = 1;
+    println!("{}", v[0][0]);
+
+
+}
+
+// Returns a dynamically-allocated array of size `n`,
+// initialized with the values computed by `f`
+
+fn init_vec<F,T>(n: usize, f: F) -> Vec<T>
+    where F: Fn() -> T
+{
+    let mut vec = Vec::with_capacity(n);
+    for _ in 0..n {
+        vec.push(f());
+    }
+    vec
+}