diff --git a/09_Day_Higher_order_functions/09_day_starter/scripts/main.js b/09_Day_Higher_order_functions/09_day_starter/scripts/main.js
index c6045c8..9264112 100644
--- a/09_Day_Higher_order_functions/09_day_starter/scripts/main.js
+++ b/09_Day_Higher_order_functions/09_day_starter/scripts/main.js
@@ -1,2 +1,114 @@
-console.log(countries)
-alert('Open the console and check if the countries has been loaded')
\ No newline at end of file
+//console.log(countries)
+// alert('Open the console and check if the countries has been loaded')
+
+const countries = ['Finland', 'Sweden', 'Denmark', 'Norway', 'IceLand']
+const names = ['Asabeneh', 'Mathias', 'Elias', 'Brook']
+const numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+const products = [
+  { product: 'banana', price: 3 },
+  { product: 'mango', price: 6 },
+  { product: 'potato', price: ' ' },
+  { product: 'avocado', price: 8 },
+  { product: 'coffee', price: 10 },
+  { product: 'tea', price: '' },
+]
+
+// Exercise level 1
+// Explain the difference betwenn forEach, Map, and reduce
+
+// Exercise 1
+/*
+    The forEach method is a higher order function that is used to loop through elements of an array and apply the provided function to each element.
+    The map function is used to transform elements of an array, it creates a new array by applying the provided function to each element of the original array.
+    The reduce function is used to process elements of an array an produce a single result.
+*/
+
+// Exercise 2
+
+
+// Exercise 3
+countries.forEach((country) => console.log(country)) 
+
+// Exercise 4
+names.forEach((name) => console.log(name)) 
+
+// Exercise 5
+numbers.forEach((number) => console.log(number))
+
+// Exercise 6
+const upperCaseCountries = countries.map((country) => country.toUpperCase());
+
+// Exercise 7
+const countriesLength = countries.map((country) => country.length);
+
+// Exercise 8
+const square = numbers.map((number) => number * number)
+
+// Exercise 9
+const upperCaseNames = names.map((name) => name.toUpperCase())
+
+// Exercise 10
+const prices = products.map(product => product.price);
+
+// Exercise 11
+const countriesWithLand = countries.filter((country) => country.includes('land'))
+
+// Exercise 12
+const countriesWithSixLetters = countries.filter((country) => country.length === 6);
+
+// Exercise 13
+const countriesWithSixLettersandMore = countries.filter((country) => country.length >= 6);
+
+// Exercise 14
+const countriesStartingWithE = countries.filter((country) => country.startsWith('E'));
+
+// Exercise 15
+const pricesWithValues = products.filter((price) => typeof products.price === 'number' && !isNaN(price));
+
+// Exercise 16
+function getStringList(array) {
+    const nonStringElements = array.filter((element) => typeof element !== 'string');
+    return nonStringElements
+}
+
+// Exercise 17
+const sumNumbers = numbers.reduce((acc, curr) => acc + curr, 0);
+
+console.log(sumNumbers)
+
+// Exercise 18
+const europeanCountries = countries.reduce((country) )
+
+// Exercise 19
+/*
+    - `some`: Returns `true` if at least one element in the array satisfies the provided condition.
+    - `every`: Returns `true` only if all elements in the array satisfy the provided condition.
+*/
+
+// Exercise 20
+const namesGreaterThanSeven = names.some((name) => name > 7);
+
+// Exercise 21
+const everyCountryWithLand = countries.every((country) => country.includes('land'))
+
+//Exercise 22
+/*
+    find: Returns the first element in the array that satisfies the provided condition, or undefined if no element is found.
+    findIndex: Returns the index of the first element in the array that satisfies the provided condition, or -1 if no element is found.
+*/
+
+// Exercise 23
+const countryWithSixLetters = countries.find((country) => country.length === 6);
+
+// Exercise 24
+const indexOfcountryWithSixLetters = countries.findIndex((country) => country.length === 6);
+
+// Exercise 25
+const indexOfNorway = countries.findIndex((country) => country === 'Norway');
+
+// Exercise 26
+const indexOfRussia = countries.findIndex((country) => country === 'Russia');
+
+
+
+