done with exs

Exercises/1-hoisting.js

@@ -1,5 +1,7 @@
 'use strict'
 
-const fn = null;
+const fn = () =>{
+ const a = 5;
+};
 
 module.exports ={fn };

Exercises/2-by-value.js

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

Exercises/3-by-reference.js

@@ -1,5 +1,9 @@
 'use strict'
 
-const inc = null;
+const inc = num =>{
+ if (typeof num === 'object'){
+ ++num.n;
+ }
+};
 
 module.exports ={inc };

Exercises/4-count-types.js

@@ -1,5 +1,13 @@
 'use strict'
 
-const countTypesInArray = null;
+const countTypesInArray = array =>{
+ const obj ={};
+ array.forEach(item =>{
+ const type = typeof item;
+ const count = obj[type] || 0;
+ obj[type] = count + 1;
+ });
+ return obj;
+};
 
 module.exports ={countTypesInArray };