Add solution directories for exercises

04_removeFromArray/solution/removeFromArray-solution.js

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+// we have 2 solutions here, an easier one and a more advanced one.
+// The easiest way to get an array of all of the arguments that are passed to a function
+// is using the rest operator. If this is unfamiliar to you look it up!
+const removeFromArray = function (...args) {
+    // the very first item in our list of arguments is the array, we pull it out with args[0]
+    const array = args[0];
+    // create a new empty array
+    const newArray = [];
+    // use forEach to go through the array
+    array.forEach((item) => {
+        // push every element into the new array
+        // UNLESS it is included in the function arguments
+        // so we create a new array with every item, except those that should be removed
+        if (!args.includes(item)) {
+            newArray.push(item);
+        }
+    });
+    // and return that array
+    return newArray;
+};
+
+// A simpler, but more advanced way to do it is to use the 'filter' function,
+// which basically does what we did with the forEach above.
+
+// var removeFromArray = function(...args) {
+//   const array = args[0]
+//   return array.filter(val => !args.includes(val))
+// }
+//
+
+module.exports = removeFromArray;

04_removeFromArray/solution/removeFromArray-solution.spec.js

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+const removeFromArray = require('./removeFromArray-solution');
+
+describe('removeFromArray', () => {
+    test('removes a single value', () => {
+        expect(removeFromArray([1, 2, 3, 4], 3)).toEqual([1, 2, 4]);
+    });
+    test.skip('removes multiple values', () => {
+        expect(removeFromArray([1, 2, 3, 4], 3, 2)).toEqual([1, 4]);
+    });
+    test.skip('ignores non present values', () => {
+        expect(removeFromArray([1, 2, 3, 4], 7, 'tacos')).toEqual([1, 2, 3, 4]);
+    });
+    test.skip('ignores non present values, but still works', () => {
+        expect(removeFromArray([1, 2, 3, 4], 7, 2)).toEqual([1, 3, 4]);
+    });
+    test.skip('can remove all values', () => {
+        expect(removeFromArray([1, 2, 3, 4], 1, 2, 3, 4)).toEqual([]);
+    });
+    test.skip('works with strings', () => {
+        expect(removeFromArray(['hey', 2, 3, 'ho'], 'hey', 3)).toEqual([
+            2,
+            'ho',
+        ]);
+    });
+    test.skip('only removes same type', () => {
+        expect(removeFromArray([1, 2, 3], '1', 3)).toEqual([1, 2]);
+    });
+});