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We are required to write a JavaScript function that takes in a string. It should print out each number for every corresponding letter in the string.For example, a = 1 b = 2 c = 3 d = 4 e = 5 . . . Y = 25 Z = 26Therefore, if the input is "hello man", Then the output should be a number for each character −"8, 5, 12, 12, 15, 13, 1, 14"ExampleFollowing is the code −const str = 'hello man'; const charPosition = str => { str = str.split(''); const arr = []; const ... Read More
We are required to write a JavaScript function that takes in a number which may be an integer or a floating-point number. If it's a floating-point number, we have to return the count of numbers after the decimal point. Otherwise we should return 0.For our example, we are considering two numbers −const num1 = 1.123456789; const num2 = 123456789;ExampleFollowing is the code −const num1 = 1.123456789; const num2 = 123456789; const decimalCount = num => { // Convert to String const numStr = String(num); // String Contains Decimal if (numStr.includes('.')) { return numStr.split('.')[1].length; ... Read More
We are required to write a JavaScript function that takes in an array of numbers and returns a number which can exactly divide all the numbers in the array.Let’s say the following is our array −const arr = [4, 6, 34, 76, 78, 44, 34, 26, 88, 76, 42];ExampleFollowing is the code −const arr = [4, 6, 34, 76, 78, 44, 34, 26, 88, 76, 42]; const dividesAll = el => { const result = []; let num; for (num = Math.floor(el / 2); num > 1; num--){ if (el % num === 0) { result.push(num); } }; return result; }; const dividesArray = arr => { return arr.map(dividesAll).reduce((acc, val) => { return acc.filter(el => val.includes(el)); }); }; console.log(dividesArray(arr));OutputThis will produce the following output in console −[ 2 ]
We are required to write a JavaScript function that takes in an array of numbers. The function should sort the array with using the Array.prototype.sort() method. We are required to use the Array.prototype.reduce() method to sort the array.Let’s say the following is our array −const arr = [4, 56, 5, 3, 34, 37, 89, 57, 98];ExampleFollowing is the code −// we will sort this array but // without using the array sort function // without using any kind of conventional loops // using the ES6 function reduce() const arr = [4, 56, 5, 3, 34, 37, 89, 57, 98]; const ... Read More
We are required to write a JavaScript function that takes in a number and returns a new number in which all the digits of the original number are squared and concatenatedFor example: If the number is −9119Then the output should be −811181because 9^2 is 81 and 1^2 is 1.ExampleFollowing is the code −const num = 9119; const squared = num => { const numStr = String(num); let res = ''; for(let i = 0; i < numStr.length; i++){ const square = Math.pow(+numStr[i], 2); res += square; }; return res; }; console.log(squared(num));OutputThis will produce the following output in console −811181
We are required to write a JavaScript function takes in an array of numbers. The function should bring all the 3-digit integers to the front of the array.Let’s say the following is our array of numbers −const numList = [1, 324,34, 3434, 304, 2929, 23, 444];ExampleFollowing is the code −const numList = [1, 324,34, 3434, 304, 2929, 23, 444]; const isThreeDigit = num => num > 99 && num < 1000; const bringToFront = arr => { for(let i = 0; i < arr.length; i++){ if(!isThreeDigit(arr[i])){ continue; }; arr.unshift(arr.splice(i, 1)[0]); }; }; bringToFront(numList); console.log(numList);OutputThis will produce the following output in console −[ 444, 304, 324, 1, 34, 3434, 2929, 23 ]
We are required to write a JavaScript function that takes in any arbitrary number of arrays and returns an array of elements that are common to all arrays. If there are no common elements, then we should return an empty array.Let’s say the following are our arrays −const arr1 = [2, 6, 7, 1, 7, 8, 4, 3]; const arr2 = [5, ,7, 2, 2, 1, 3]; const arr3 = [1, 56, 345, 6, 54, 2, 68, 85, 3];ExampleFollowing is the code −const arr1 = [2, 6, 7, 1, 7, 8, 4, 3]; const arr2 = [5, ,7, 2, 2, ... Read More
Suppose, we have an array of objects like this −const people = [ {"id":1, "name":"Andrew", "age":30, "gender":"m", "category":"G"}, {"id":2, "name":"Brandon", "age":25, "gender":"m", "category":"G"}, {"id":3, "name":"Christine", "age":20, "gender":"m", "category":"G"}, {"id":4, "name":"Elena", "age":29, "gender":"W", "category":"M"} ];We are required to write a JavaScript function that takes in one such array and sorts the array in place, according to the age property of each object in increasing order.Therefore, the output should look something like this −const output = [ {"id":3, "name":"Christine", "age":20, "gender":"m", "category":"G"}, {"id":2, "name":"Brandon", "age":25, "gender":"m", "category":"G"}, {"id":4, "name":"Elena", "age":29, "gender":"W", "category":"M"}, {"id":1, ... Read More
We are required to write a JavaScript function that takes in an array, a start index and an end index. The function should reverse the portion of the array between the start index and end index.For example −If the array is −const arr = [2, 6, 5, 8, 3, 5, 2, 6, 7];And the start index and end index are 3, 7 respectively, then the array should be reversed to −const output = [2, 6, 5, 2, 5, 3, 8, 6, 7];ExampleFollowing is the code −const arr = [2, 6, 5, 8, 3, 5, 2, 6, 7]; const start = ... Read More
In Mathematics, the symmetric difference of two sets, say A and B is represented by A △ BAnd it is defined as the set of all those elements which belongs either to A or to B but not to both.For example −const A = [1, 2, 3, 4, 5, 6, 7, 8]; const B = [1, 3, 5, 6, 7, 8, 9];Then the symmetric difference of A and B will be −const diff = [2, 4, 9]ExampleFollowing is the code −const A = [1, 2, 3, 4, 5, 6, 7, 8]; const B = [1, 3, 5, 6, 7, 8, ... Read More