Add deno test case

Author: o-p

problems/0001-two-sum/two-sum.test.deno.ts

@@ -0,0 +1,23 @@
+import {
+  assertArrayIncludes,
+  assertEquals,
+} from "https://deno.land/std@0.79.0/testing/asserts.ts";
+
+import twoSum from './two-sum.ts'
+
+Deno.test('[#0001] Two Sum', (): void => {
+  assertEquals(
+    twoSum([2, 7, 11, 15], 9),
+    [0, 1],
+  );
+
+  assertEquals(
+    twoSum([3, 2, 4], 6),
+    [1, 2],
+  );
+
+  assertEquals(
+    twoSum([3, 3], 6),
+    [0, 1],
+  );
+})

problems/0001-two-sum/two-sum.test.ts

@@ -0,0 +1,10 @@
+import twoSum from './two-sum.ts';
+
+test.each`
+       nums         | target | expected
+  ${[2, 7, 11, 15]} | ${9}   | ${[0, 1]}
+  ${[3, 2, 4]}      | ${6}   | ${[1, 2]}
+  ${[3, 3]}         | ${6}   | ${[0, 1]}
+`('Two Sum: ($nums, $target)', ({ nums, target, expected }) =>
+  expect(twoSum(nums, target)).toEqual(expected)
+);

problems/0001-two-sum/two-sum.ts

@@ -0,0 +1,16 @@
+const twoSum = (nums: Array<number>, target: number): Array<number> => {
+  const cached: { [index:number]: number } = {}
+  let result: Array<number> = []
+
+  nums.some((num: number, index: number): boolean => {
+    if (typeof cached[target - num] === 'number') {
+      result = [cached[target - num], index]
+      return true
+    }
+    cached[num] = index
+    return false
+  })
+  return result
+};
+
+export default twoSum;