create 0179 in rust ,scala, swift

Author: Mohammed785

rust/0179-largest-number.rs

@@ -0,0 +1,11 @@
+impl Solution {
+    pub fn largest_number(nums: Vec<i32>) -> String {
+        let mut v: Vec<String> = nums.iter().map(|&num| num.to_string()).collect();
+        v.sort_by(|a: &String, b: &String| (b.clone() + a).cmp(&(a.clone() + b)));
+        if v[0] == "0" {
+            String::from("0")
+        } else {
+            v.join("")
+        }
+    }
+}

scala/0179-largest-number.scala

@@ -0,0 +1,5 @@
+object Solution {
+  def largestNumber(nums: Array[Int]): String = {
+    BigInt(nums.map(_.toString).sortWith((l, r) => l ++ r >= r ++ l).foldLeft("")(_ + _)).toString
+  }
+}

swift/0179-largest-number.swift

@@ -0,0 +1,5 @@
+class Solution {
+    func largestNumber(_ nums: [Int]) -> String {
+        return nums.reduce(into: Bool(false), { $0 = $0 || $1 > 0 }) ? nums.map { String($0) }.sorted { $0 + $1 > $1 + $0 }.joined() : "0"
+    }
+}