JS test solutons has been added

Author: Asabeneh

readMe.md

@@ -2120,6 +2120,8 @@ localStorage.clear();
 ##### [JavaScript Test 2](https://github.com/Asabeneh/JavaScript-for-Everyone/wiki/JavaScript-Test-2)
 ##### [JavaScript Test 3](https://github.com/Asabeneh/JavaScript-for-Everyone/wiki/JavaScript-Test-3)
 - [JavaScript Test 3: Solutions](https://github.com/Asabeneh/JavaScript-for-Everyone/blob/master/solutions/javascript-test-3.js)
+JavaScript-Test-4)
+- [JavaScript Test 4: Solutions](https://github.com/Asabeneh/JavaScript-for-Everyone/blob/master/solutions/javascript-test-4.js)
 
 ___
 

solutions/javascript-test-1.js

@@ -0,0 +1,203 @@
+/**** QUESTION 1: Printing Hashes ****/
+console.log('*** QUESTION 1: Printing Hashes ***');
+const printHashes = () => {
+  let hash = '';
+  for (let i = 0; i < 7; i++) {
+    hash += '#';
+    console.log(hash);
+  }
+}
+printHashes();
+/**** QUESTION 2: FizzBuz ****/
+console.log('*** QUESTION 2: FizzBuz ***');
+const fizzBuz  = () =>  {
+  for (let i = 1; i <= 100; i++) {
+    if (i % 3 === 0 && i % 5 === 0) {
+      console.log('FizBuzz', i);
+    } else if (i % 3 !== 0 && i % 5 == 0) {
+      console.log('Buz', i);
+    } else if (i % 3 == 0) {
+      console.log('Fizz', i);
+    } else {
+      console.log(i);
+    }
+  }
+}
+fizzBuz();
+/**** QUESTION 3: Maximum ***
+ *
+ *
+ */
+console.log('*** QUESTION 3: Maximum ***');
+const findMax = (a, b, c) => {
+  let max;
+  if (a > b && a > c) {
+    max = a;
+  } else if (b > a && b > c) {
+    max = b;
+  } else {
+    max = c;
+  }
+  return max;
+}
+console.log(findMax(10, -9, 5));
+console.log(findMax(-10, -9, -20));
+console.log(findMax(-10, -9, 20));
+
+/*
+ *** QUESTION 4: Reverse Array ***
+ */
+console.log('*** QUESTION 4: Reverse Array ***');
+const reverseArray = (arr) => {
+  let newArr = [];
+  let len = arr.length - 1;
+  for (let i = 0; i <= len; i++) {
+    newArr[i] = arr[len - i];
+  }
+  return newArr;
+}
+console.log(reverseArray([1, 2, 3, 4, 5]));
+console.log(reverseArray(['A', 'B', 'C']));
+
+/*
+ *** QUESTION 5: Modify Array***
+ */
+console.log('*** QUESTION 5: Modify Array***');
+const modifyArray = (arr) => {
+  let modifiedArr = [];
+  if (arr.length < 5) {
+    return 'Not Found';
+  }
+  for (let i = 0; i < arr.length; i++)
+    i === 4
+      ? (modifiedArr[i] = arr[i].toUpperCase())
+      : (modifiedArr[i] = arr[i]);
+
+  return modifiedArr;
+}
+console.log(
+  modifyArray(['Avocado', 'Tomato', 'Potato', 'Mango', 'Lemon', 'Carrot'])
+);
+
+/*
+ *** QUESTION 6 : Seven unique random numbers in an array***
+ */
+console.log('*** QUESTION 6 : Seven unique random numbers in an array***');
+// solution 1
+function sevenRandomNumbers() {
+  const randNumbers = [];
+  while (randNumbers.length < 7) {
+    const randNum = Math.floor(Math.random() * 9) + 1;
+    if (randNumbers.indexOf(randNum) === -1) {
+      randNumbers.push(randNum);
+    }
+  }
+  return randNumbers;
+}
+
+console.log(sevenRandomNumbers());
+// solution 2
+function sevenRandomNumbers() {
+  const randNumbers = [];
+  let i = 0;
+  let randNum;
+  let len = randNumbers.length;
+  while (i < 7) {
+    randNum = Math.floor(Math.random() * 10 + 1);
+    if (i == 0) {
+      randNumbers[i] = randNum;
+    } else {
+      if (randNumbers.indexOf(randNum) == -1) {
+        randNumbers[i] = randNum;
+      } else {
+        i--;
+      }
+    }
+    i++;
+  }
+
+  return randNumbers;
+}
+console.log(sevenRandomNumbers());
+function sevenRandomNumber() {
+  const randNumbers = [];
+  while (array.length < 7) {
+    const random = Math.floor(Math.random() * 9);
+    if (randNumbers.indexOf(random) === -1) {
+      randNumbers.push(random);
+    }
+  }
+  console.log(randNumbers);
+  return randNumbers;
+}
+
+sevenRandomNumber();
+
+/*
+ *** QUESTION 7: Sum ***
+ */
+console.log('*** QUESTION 7: Sum of any number of arguments***');
+const sumOfArgs = (...args) => {
+  let total = 0;
+  args.forEach(arg => (total += arg));
+  return total;
+};
+console.log(sumOfArgs(1, 2, 3));
+console.log(sumOfArgs(1, 2, 3, 4));
+
+function sum() {
+  let total = 0;
+  Array.from(arguments).forEach(arg => (total += arg));
+  return total;
+}
+
+console.log(sum(1, 2, 3));
+console.log(sum(1, 2, 3, 4));
+/*
+ *** QUESTION 8: Replace the middle item with three items***
+ */
+console.log('*** QUESTION 8: Replace the middle item with three items***');
+const removeMiddleItem = (arr, itemOne, itemTwo, itemThree) => {
+  let arrayLen = arr.length;
+  let middleIndex;
+  if (arrayLen % 2 === 0) {
+    middleIndex = arrayLen / 2 - 1;
+    arr.splice(middleIndex, 2, itemOne, itemTwo, itemThree);
+  } else {
+    middleIndex = (arrayLen + 1) / 2 - 1;
+    arr.splice(middleIndex, 1, itemOne, itemTwo, itemThree);
+  }
+  return arr;
+}
+console.log(removeMiddleItem([1, 2, 3], 'item 1', 'item2', 'item3'));
+console.log(removeMiddleItem([1, 2, 3, 4], 'item 1', 'item2', 'item3'));
+console.log(removeMiddleItem([1, 2, 3], 4, 5, 6));
+/*
+ *** QUESTION 9: Extract numbers from text ***
+ */
+console.log('*** QUESTION 9: Extract numbers from a text ***');
+const calculateAnnualIncome = () => {
+  const pattern = /[0-9]+/g;
+  const incomes = 'He earns 5000 euro from salary per month, 10000 euro annual bonus, 15000 euro online courses per month.'.match(
+    pattern
+  );
+  let sum = 0;
+  incomes.forEach((income, i) => {
+    if (i == 0 || i == 2) {
+      sum += parseFloat(income) * 12;
+    } else {
+      sum += parseFloat(income);
+    }
+  });
+  return sum;
+}
+console.log(calculateAnnualIncome());
+/*
+ *** QUESTION 10: Check if a sub string is an end of a text ***
+ */
+console.log('*** QUESTION 10: Check if a sub string is an end of a text ***');
+const checkEndOfString = (mainString, subString) => {
+  return mainString.endsWith(subString);
+}
+console.log(checkEndOfString('integrity', 'ity'));
+console.log(checkEndOfString('integration', 'tio'));