diff --git a/Exercises/1-hoisting.js b/Exercises/1-hoisting.js
index 0920026..ab6ab6b 100644
--- a/Exercises/1-hoisting.js
+++ b/Exercises/1-hoisting.js
@@ -1,5 +1,8 @@
'use strict';
-const fn = null;
+const fn = function raising() {
+ const variable = 'Hello';
+ console.log(variable);
+};
module.exports = { fn };
diff --git a/Exercises/2-by-value.js b/Exercises/2-by-value.js
index f576b24..80e623e 100644
--- a/Exercises/2-by-value.js
+++ b/Exercises/2-by-value.js
@@ -1,5 +1,9 @@
'use strict';
-const inc = null;
+const inc = (x) => ++x;
+
+// function inc(n) {
+// return n+1;
+// }
module.exports = { inc };
diff --git a/Exercises/3-by-reference.js b/Exercises/3-by-reference.js
index 74638ec..c7e21a3 100644
--- a/Exercises/3-by-reference.js
+++ b/Exercises/3-by-reference.js
@@ -1,7 +1,15 @@
'use strict';
-const inc = (obj) => {
- console.log(obj);
+const inc = function(obj) {
+ obj.n += 1;
};
+// function inc(num) {
+// if (num && typeof num.n === 'number') {
+// num.n += 1;
+// } else {
+// throw new Error("Invalid input: Object must have a numeric 'n' field");
+// }
+// }
+
module.exports = { inc };
diff --git a/Exercises/4-count-types.js b/Exercises/4-count-types.js
index 4c9545a..ff1faae 100644
--- a/Exercises/4-count-types.js
+++ b/Exercises/4-count-types.js
@@ -1,5 +1,12 @@
'use strict';
-const countTypesInArray = null;
+function countTypesInArray(arr) {
+ const result = {};
+ for (const item of arr) {
+ const type = typeof item;
+ result[type] = (result[type] || 0) + 1;
+ }
+ return result;
+}
module.exports = { countTypesInArray };
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