Add an Exercises folder. Add autotest

Exercises/1-showelem.js

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+'use strict';
+
+const deepSum = (array) => {
+  // use recursion to sum all element of array
+  // deepSum([1, [2, 3, [4, [5]]], 6, [33]]) = 54
+};
+
+module.exports = { deepSum };

Exercises/1-showelem.test

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+({
+  name: 'deepSum',
+  length: [150, 230],
+  cases: [
+    [[1, 2, 3], 6],
+    [[0], 0],
+    [[1, -1, 1], 1],
+    [[10, -1, -1, -1], 7],
+    [[1, [2, 3, [4, [5]]], 6, [33]], 54],
+  ],
+  test(deepSum) {
+    const src = deepSum.toString();
+    const numbers = [1, 'string', [12, 3]];
+    const sum = deepSum(numbers);
+    if (isNaN(sum)) throw new Error('Do not add string');
+    if (!src.includes('deepSum(')) throw new Error('Use recursion');
+    if (!src.includes('return')) throw new Error('Use return');
+   }
+})

Exercises/2-powloop.js

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+'use strict';
+
+const pow = (base, power) => {
+  // use loop to raise a number to a power
+  // do not use recursion
+};
+
+module.exports = { pow };

Exercises/2-powloop.test

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+({
+  name: 'pow',
+  length: [110, 140],
+  cases: [
+    [2, 1, 2],
+    [2, 2, 4],
+    [2, 3, 8],
+    [2, 10, 1024]
+  ],
+  test(pow) {
+    const src = pow.toString();
+    if (src.includes('pow(')) throw new Error('Do not use recursion');
+    if (!src.includes('return')) throw new Error('Use return');
+   }
+})