Asabeneh · Parth2009 · Sep 28, 2024 · Sep 29, 2024
diff --git a/solutions/day-01/countries.js b/solutions/day-01/countries.js
@@ -0,0 +1,13 @@
+export const countries = [
+  "Albania",
+  "Bolivia",
+  "Canada",
+  "Denmark",
+  "Ethiopia",
+  "Finland",
+  "Germany",
+  "Hungary",
+  "Ireland",
+  "Japan",
+  "Kenya",
+];
diff --git a/solutions/day-01/index.html b/solutions/day-01/index.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Day 1</title>
+</head>
+<body>
+    <script src="./level1.js"></script>
+    <script type="module" src="./main.js"></script>
+</body>
+</html>
diff --git a/solutions/day-01/level1.js b/solutions/day-01/level1.js
@@ -0,0 +1,143 @@
+// Exercise: Level 1
+console.log("Exercise: Level 1");
+
+const countries = [
+  "Albania",
+  "Bolivia",
+  "Canada",
+  "Denmark",
+  "Ethiopia",
+  "Finland",
+  "Germany",
+  "Hungary",
+  "Ireland",
+  "Japan",
+  "Kenya",
+];
+
+const webTechs = [
+  "HTML",
+  "CSS",
+  "JavaScript",
+  "React",
+  "Redux",
+  "Node",
+  "MongoDB",
+];
+
+// Declare an empty array;
+let emptyArray = [];
+
+// Declare an array with more than 5 number of elements
+let arrayWithMoreThanFiveElements = [1, 2, 3, 4, 5, 6];
+
+// Find the length of your array
+let arrayLength = arrayWithMoreThanFiveElements.length;
+
+// Get the first item, the middle item and the last item of the array
+let firstItem = arrayWithMoreThanFiveElements[0];
+let middleItem = arrayWithMoreThanFiveElements[Math.floor(arrayLength / 2)];
+let lastItem = arrayWithMoreThanFiveElements[arrayLength - 1];
+
+// Declare an array called mixedDataTypes, put different data types in the array and find the length of the array. The array size should be greater than 5
+let mixedDataTypes = [1, "a", true, 3.14, null, [1]];
+
+// Declare an array variable name itCompanies and assign initial values Facebook, Google, Microsoft, Apple, IBM, Oracle and Amazon
+let itCompanies = [
+  "Facebook",
+  "Google",
+  "Microsoft",
+  "Apple",
+  "IBM",
+  "Oracle",
+  "Amazon",
+];
+
+// Print the array using console.log()
+console.log(itCompanies);
+
+// Print the number of companies in the array
+console.log(itCompanies.length);
+
+// Print the first company, middle and last company
+console.log(itCompanies[0]);
+console.log(itCompanies[Math.floor(itCompanies.length / 2)]);
+console.log(itCompanies[itCompanies.length - 1]);
+
+// Print out each company
+console.log(itCompanies.join(", "));
+
+// Change each company name to uppercase one by one and print them out
+console.log(itCompanies.map((company) => company.toUpperCase()));
+
+// Print the array like as a sentence: Facebook, Google, Microsoft, Apple, IBM,Oracle and Amazon are big IT companies.
+console.log(
+  itCompanies
+    .join(", ")
+    .concat(" and ")
+    .concat(itCompanies[itCompanies.length - 1])
+);
+
+// Check if a certain company exists in the itCompanies array. If it exist return the company else return a company is not found
+console.log(
+  itCompanies.includes("Google") ? "Company found" : "Company not found"
+);
+
+// Filter out companies which have more than one 'o' without the filter method
+const companies = [
+  "Google",
+  "Microsoft",
+  "Facebook",
+  "Amazon",
+  "Oracle",
+  "Sony",
+];
+const filteredCompanies = [];
+
+for (let company of companies) {
+  let oCount = 0;
+
+  // Efficiently count 'o' and break early if more than 1
+  for (let char of company) {
+    if (char.toLowerCase() === "o") {
+      oCount++;
+      if (oCount > 1) break; // Stop checking further if more than 1 'o' is found
+    }
+  }
+
+  if (oCount <= 1) {
+    filteredCompanies.push(company);
+  }
+}
+
+console.log(filteredCompanies);
+
+// Sort the array using sort() method
+itCompanies.sort((a, b) => a.localeCompare(b));
+
+// Reverse the array using reverse() method
+itCompanies.reverse();
+
+// Slice out the first 3 companies from the array
+itCompanies.slice(0, 3);
+
+// Slice out the last 3 companies from the array
+itCompanies.slice(-3);
+
+// Slice out the middle IT company or companies from the array
+itCompanies.slice(
+  Math.floor(itCompanies.length / 2),
+  Math.floor(itCompanies.length / 2) + 2
+);
+
+// Remove the first IT company from the array
+itCompanies.shift();
+
+// Remove the middle IT company or companies from the array
+itCompanies.splice(Math.floor(itCompanies.length / 2), 1);
+
+// Remove the last IT company from the array
+itCompanies.pop();
+
+// Remove all IT companies
+itCompanies.splice(0, itCompanies.length);
diff --git a/solutions/day-01/main.js b/solutions/day-01/main.js
@@ -0,0 +1,101 @@
+// Exercise: Level 2
+console.log("Exercise: Level 2");
+
+// Create a separate countries.js file and store the countries array into this file, create a separate file web_techs.js and store the webTechs array into this file. Access both file in main.js file
+
+import { countries } from "./countries.js";
+import { webTechs } from "./web_techs.js";
+
+// First remove all the punctuations and change the string to array and count the number of words in the array
+
+let text =
+  "I love teaching and empowering people. I teach HTML, CSS, JS, React, Python.";
+let textArray = text.replace(/[^\w\s]|_/g, "").split(" ");
+let textCount = textArray.length;
+console.log(textArray);
+console.log(textCount);
+// ["I", "love", "teaching", "and", "empowering", "people", "I", "teach", "HTML", "CSS", "JS", "React", "Python"]
+
+// 13
+// In the following shopping cart add, remove, edit items
+
+const shoppingCart = ["Milk", "Coffee", "Tea", "Honey"];
+// add 'Meat' in the beginning of your shopping cart if it has not been already added
+if (!shoppingCart.includes("Meat")) shoppingCart.unshift("Meat");
+
+// add Sugar at the end of you shopping cart if it has not been already added
+if (!shoppingCart.includes("Sugar")) shoppingCart.push("Sugar");
+
+// remove 'Honey' if you are allergic to honey
+if (shoppingCart.includes("Honey"))
+  shoppingCart.splice(shoppingCart.indexOf("Honey"), 1);
+
+// modify Tea to 'Green Tea'
+shoppingCart[shoppingCart.indexOf("Tea")] = "Green Tea";
+console.log(shoppingCart);
+
+// In countries array check if 'Ethiopia' exists in the array if it exists print 'ETHIOPIA'. If it does not exist add to the countries list.
+if (countries.includes("Ethiopia")) {
+  console.log("ETHIOPIA");
+} else {
+  countries.push("Ethiopia");
+}
+
+// In the webTechs array check if Sass exists in the array and if it exists print 'Sass is a CSS preprocess'. If it does not exist add Sass to the array and print the array.
+if (webTechs.includes("Sass")) {
+  console.log("Sass is a CSS preprocess");
+} else {
+  webTechs.push("Sass");
+  console.log(webTechs);
+}
+
+// Concatenate the following two variables and store it in a fullStack variable.
+
+const frontEnd = ["HTML", "CSS", "JS", "React", "Redux"];
+const backEnd = ["Node", "Express", "MongoDB"];
+const fullStack = [...frontEnd, ...backEnd];
+
+console.log(fullStack);
+// ["HTML", "CSS", "JS", "React", "Redux", "Node", "Express", "MongoDB"]
+
+// Exercise: Level 3
+// The following is an array of 10 students ages: js
+const ages = [19, 22, 19, 24, 20, 25, 26, 24, 25, 24];
+// - Sort the array and find the min and max age
+ages.sort((a, b) => a - b);
+console.log(ages);
+// - Find the median age(one middle item or two middle items divided by two)
+const middleIndex = Math.floor(ages.length / 2);
+const medianAge =
+  ages.length % 2 !== 0
+    ? ages[middleIndex]
+    : (ages[middleIndex - 1] + ages[middleIndex]) / 2;
+
+console.log(medianAge);
+// - Find the average age(all items divided by number of items)
+const sumOfAges = ages.reduce((acc, age) => acc + age, 0);
+const averageAge = sumOfAges / ages.length;
+console.log(averageAge);
+
+// - Find the range of the ages(max minus min)
+const rangeOfAges = Math.max(...ages) - Math.min(...ages);
+console.log(rangeOfAges);
+
+// - Compare the value of (min - average) and (max - average), use abs() method
+const minAvgDiff = Math.abs(Math.min(...ages) - averageAge / ages.length);
+const maxAvgDiff = Math.abs(Math.max(...ages) - averageAge / ages.length);
+console.log(minAvgDiff);
+console.log(maxAvgDiff);
+
+// 1.Slice the first ten countries from the countries array
+console.log(countries.slice(0, 10));
+
+// Find the middle country(ies) in the countries array
+const middleIndexC = Math.floor(countries.length / 2);
+console.log(middleIndexC);
+
+// Divide the countries array into two equal arrays if it is even. If countries array is not even , one more country for the first half.
+const firstHalf = countries.slice(0, middleIndexC + (countries.length % 2));
+const secondHalf = countries.slice(middleIndexC + (countries.length % 2));
+console.log(firstHalf);
+console.log(secondHalf);
diff --git a/solutions/day-01/web_techs.js b/solutions/day-01/web_techs.js
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+export const webTechs = [
+  "HTML",
+  "CSS",
+  "JavaScript",
+  "React",
+  "Redux",
+  "Node",
+  "MongoDB",
+];