First commit

Exercises/1-hoisting.js

@@ -1,5 +1,8 @@
 'use strict';
 
-const fn = null;
+const fn = () => {
+  console.log({ x });
+  var x = 5;
+};
 
 module.exports = { fn };

Exercises/2-by-value.js

@@ -1,5 +1,5 @@
 'use strict';
 
-const inc = null;
+const inc = (n) => ++n;
 
 module.exports = { inc };

Exercises/3-by-reference.js

@@ -1,7 +1,9 @@
 'use strict';
 
-const inc = (obj) => {
-  console.log(obj);
+const inc = (num) => {
+  if (typeof num === 'object') {
+    num.n++;
+  }
 };
 
 module.exports = { inc };

Exercises/4-count-types.js

@@ -1,5 +1,15 @@
 'use strict';
 
-const countTypesInArray = null;
+const countTypesInArray = (ArrayOfTypes) => {
+  const countTypes = {};
+  for (const item of ArrayOfTypes) {
+    const type = typeof item;
+    let count = countTypes[type];
+    count = count ? count++ : count = 0;
+    countTypes[type] = count;
+  };
+
+  return countTypes;
+};
 
 module.exports = { countTypesInArray };