Found 9326 Articles for Object Oriented Programming

Suppose, we have a floating-point number −2.74If we divide this number by 4, the result is 0.685.We want to divide this number by 4 but the result should be rounded to 2 decimals.Therefore, the result should be −3 times 0.69 and a remainder of 0.67ExampleThe code for this will be −const num = 2.74; const parts = 4; const divideWithPrecision = (num, parts, precision = 2) => {    const quo = +(num / parts).toFixed(precision);    const remainder = +(num - quo * (parts - 1)).toFixed(precision);    if(quo === remainder){       return {          parts, ... Read More

A mathematician Ulam proposed generating a sequence of numbers from any positive integer n (n>0) as follows −If n is 1, it will stop. if n is even, the next number is n/2. if n is odd, the next number is 3 * n + 1. continue with the process until reaching 1.Here are some examples for the first few integers −2->1 3->10->5->16->8->4->2->1 4->2->1 6->3->10->5->16->8->4->2->1 7->22->11->34->17->52->26->13->40->20->10->5->16->8->4->2->1We are required to write a JavaScript function that takes in a number and returns the Ulam sequence starting with that number.ExampleThe code for this will be −const num = 7; const generateUlam = num ... Read More

Suppose, we have a JSON array like this −const arr = [{    "data": [       { "W": 1, "A1": "123" },       { "W": 1, "A1": "456" },       { "W": 2, "A1": "4578" },       { "W": 2, "A1": "2423" },       { "W": 2, "A1": "2432" },       { "W": 2, "A1": "24324" }    ] }];We are required to write a JavaScript function that takes in one such array and converts it to the following JSON array −[    {       "1": ... Read More

We are required to write a function that takes in an array of numbers as the first argument and a target sum as the second argument. We then want to loop through the array and then add each value to each other (except itself + itself).And if the sum of the two values that were looped through equals the target sum, and the pair of values hasn't been encountered before, then we remember their indices and, at the end, return the full sum of all remembered indices.If the array is −const arr = [1, 4, 2, 3, 0, 5];And the ... Read More

Suppose, we have two arrays of literals and objects respectively −const source = [1, 2, 3 , 4 , 5]; const cities = [{ city: 4 }, { city: 6 }, { city: 8 }];We are required to write a JavaScript function that takes in these two arrays. Our function should create a new array that contains all those elements from the array of objects whose value for "city" key is present in the array of literals.ExampleLet us write the code −const source = [1, 2, 3 , 4 , 5]; const cities = [{ city: 4 }, { city: ... Read More

We are required to write a JavaScript function that takes in two objects. The function should return an array of all those common keys that have common values across both objects.ExampleThe code for this will be −const obj1 = { a: true, b: false, c: "foo" }; const obj2 = { a: false, b: false, c: "foo" }; const compareObjects = (obj1 = {}, obj2 = {}) => {    const common = Object.keys(obj1).filter(key => {       if(obj1[key] === obj2[key] && obj2.hasOwnProperty(key)){          return true;       };       return false;    });    return common; }; console.log(compareObjects(obj1, obj2));OutputAnd the output in the console will be −['b', 'c']

We know that there are two ways we can access nested keys within an Object in JavaScript.For instance, take this object −const obj = {    object: {       foo: {          bar: {             ya: 100          }       }    } };If we needed to access or update the nested property 'ya', we can access it like −Way 1 −obj['object']['foo']['bar']['ya']orWay 2 −obj.object.foo.bar.yaBoth these ways lead us to the same destination.We are required to write a JavaScript function that takes in the path to ... Read More

Suppose, we have an array of objects like this −const arr = [    {       "customer": "Customer 1",       "project": "1"    },    {       "customer": "Customer 2",       "project": "2"    },    {       "customer": "Customer 2",       "project": "3"    } ]We are required to write a JavaScript function that takes one such array, and yields (returns) a new array.In the new array, all the customer keys with same values should be merged and the output should look something like this −const output ... Read More

We are required to write a JavaScript function that takes in an array of strings, (they may be a single character or greater than that). Our function should simply count all the vowels contained in the array.ExampleLet us write the code −const arr = ['Amy','Dolly','Jason','Madison','Patricia']; const countVowels = (arr = []) => {    const legend = 'aeiou';    const isVowel = c => legend.includes(c);    let count = 0;    arr.forEach(el => {       for(let i = 0; i < el.length; i++){          if(isVowel(el[i])){             count++;          };       };    });    return count; }; console.log(countVowels(arr));OutputAnd the output in the console will be −10

Suppose we have an array that contains name of some people like this:const arr = ['Amy', 'Dolly', 'Jason', 'Madison', 'Patricia'];We are required to write a JavaScript function that takes in one such string as the first argument, and two lowercase alphabet characters as second and third argument. Then, our function should filter the array to contain only those elements that start with the alphabets that fall within the range specified by the second and third argument.Therefore, if the second and third argument are 'a' and 'j' respectively, then the output should be −const output = ['Amy', 'Dolly', 'Jason'];ExampleLet us write ... Read More