added selection sort logic in typescript (jainaman224#2693)

Selection_Sort/Selection_Sort.ts

@@ -0,0 +1,35 @@
+// function for selection sort logic
+function Selection_Sort(numbers: number[]) : number[]{
+
+    let i: number;
+    let j: number;
+    let min: number;
+    let temp: number;
+
+    // outer loop to traverse through each element
+    for(i = 0; i < numbers.length - 1; i++){
+        min = i;
+
+        // inner loop finds the minimum element and puts it in the beginning.
+        for(j = i + 1; j < numbers.length; j++){
+            if(numbers[j] < numbers[min]){
+                min = j;
+            }
+        } // inner loop ends
+
+        if(i !== min){
+            temp = numbers[i];
+            numbers[i] = numbers[min];
+            numbers[min] = temp;
+        }
+    } // outer loop ends
+
+    return numbers;
+}
+
+const numbers: number[] = [10, 9, 8, 1, 5, 2, 4, 7, 3];
+
+console.log(Selection_Sort(numbers));
+
+// INPUT [10, 9, 8, 1, 5, 2, 4, 7, 3]
+// OUTPUT [ 1, 2, 3, 4, 5, 7, 8, 9, 10 ]