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Javascript Articles
Page 349 of 534
Program to find largest of three numbers - JavaScript
We are required to write a JavaScript function that takes in three or more numbers and returns the largest of those numbers.For example: If the input numbers are −4, 6, 7, 2, 3Then the output should be −7ExampleLet’s write the code for this function −// using spread operator to cater any number of elements const findGreatest = (...nums) => { let max = -Infinity; for(let i = 0; i < nums.length; i++){ if(nums[i] > max){ max = nums[i]; }; }; return max; }; console.log(findGreatest(5, 6, 3, 5, 7, 5));OutputThe output in the console −7
Read MoreSplit number into n length array - JavaScript
We are required to write a JavaScript function that takes in two numbers say m and n, and returns an array of size n with all the elements of the resulting array adding up to m.Let’s write the code for this function −ExampleFollowing is the code −const len = 8; const sum = 5; const splitNumber = (len, sum) => { const res = []; for(let i = 0; i < len; i++){ res.push(sum / len); }; return res; }; console.log(splitNumber(len, sum));OutputThe output in the console: −[ 0.625, 0.625, 0.625, 0.625, 0.625, 0.625, 0.625, 0.625 ]
Read MoreAdd two array keeping duplicates only once - JavaScript
Suppose, we have two arrays of literals like these :const arr1 = [2, 4, 5, 3, 7, 8, 9]; const arr2 = [1, 4, 5, 2, 3, 7, 6];We are required to write a JavaScript function that takes in two such arrays and returns a new array with all the duplicates removed (should appear only once).ExampleLet’s write the code for this function −const arr1 = [2, 4, 5, 3, 7, 8, 9]; const arr2 = [1, 4, 5, 2, 3, 7, 6]; const mergeArrays = (first, second) => { const { length: l1 } = first; const { ...
Read MoreObject to array - JavaScript
Suppose, we have an object of key value pairs like this −const obj = { name: "Vikas", age: 45, occupation: "Frontend Developer", address: "Tilak Nagar, New Delhi", experience: 23, salary: "98000" };We are required to write a function that takes in the object and returns an array of arrays with each subarray representing one key value pairExampleLet’s write the code for this function −const obj = { name: "Vikas", age: 45, occupation: "Frontend Developer", address: "Tilak Nagar, New Delhi", experience: 23, salary: "98000" }; const objectToArray = obj ...
Read MoreFinding difference of greatest and the smallest digit in a number - JavaScript
We are required to write a JavaScript function that takes in a number and returns the difference between the greatest and the smallest digit present in it.For example: If the number is 5464676, then the smallest digit here is 4 and the greatest is 7Hence, our output should be 3ExampleLet’s write the code for this function −const num = 44353456; const difference = (num, min = Infinity, max = -Infinity) => { if(num){ const digit = num % 10; return difference(Math.floor(num / 10), Math.min(digit, min), Math.max(digit, max)); }; return max - min; }; console.log(difference(num));OutputThe output in the console: −3
Read MoreSwitch case calculator in JavaScript
Let’s say, we are required to write a JavaScript function that takes in a string like these to create a calculator −"4 add 6" "6 divide 7" "23 modulo 8"Basically, the idea is that the string will contain two numbers on either sides and a string representing the operation in the middle.The string in the middle can take one of these five values −"add", "divide", "multiply", "modulo", "subtract"Our job is to return the correct result based on the stringExampleLet’s write the code for this function −const problem = "3 add 16"; const calculate = opr => { const [num1, ...
Read MoreSumming numbers from a string - JavaScript
We are required to write a JavaScript function that takes in a string that contains some one-digit numbers in between and the function should return the sum of all the numbers present in the string.Let’s say the following is our string with numbers −const str = 'gdf5jhhj3hbj4hbj3jbb4bbjj3jb5bjjb5bj3';ExampleLet's write the code for this −const str = 'gdf5jhhj3hbj4hbj3jbb4bbjj3jb5bjjb5bj3'; const sumStringNum = str => { const strArr = str.split(""); let res = 0; for(let i = 0; i < strArr.length; i++){ if(+strArr[i]){ res += +strArr[i]; }; }; return ...
Read MoreAlternate addition multiplication in an array - JavaScript
We are required to write a JavaScript function that takes in an array of numbers and returns the alternative multiplicative sum of the elementsFor example −If the array is −const arr = [1, 2, 4, 1, 2, 3, 4, 3];then the output should be calculated like this −1*2+4*1+2*3+4*3 2+4+6+12And the output should be −24ExampleLet's write the code for this −const arr = [1, 2, 4, 1, 2, 3, 4, 3]; const alternateOperation = arr => { const productArr = arr.reduce((acc, val, ind) => { if(ind % 2 === 1){ return acc; }; acc.push(val * (arr[ind + 1] || 1)); return acc; }, []); return productArr.reduce((acc, val) => acc + val); }; console.log(alternateOperation(arr));OutputThe output in the console: −24
Read MoreConvert object to a Map - JavaScript
Suppose we have an object like this −const obj = { name: "Vikas", age: 45, occupation: "Frontend Developer", address: "Tilak Nagar, New Delhi", experience: 23, };We are required to write a JavaScript function that takes in such an object with key value pairs and converts it into a Map.ExampleLet's write the code for this −const obj = { name: "Vikas", age: 45, occupation: "Frontend Developer", address: "Tilak Nagar, New Delhi", experience: 23, salary: "98000" }; const objectToMap = obj => { const keys = Object.keys(obj); const map ...
Read MoreConvert nested array to string - JavaScript
We are required to write a JavaScript function that takes in a nested array of literals and converts it to a string by concatenating all the values present in it to the stringconst arr = [ 'hello', [ 'world', 'how', [ 'are', 'you', [ 'without', 'me' ] ] ] ];ExampleLet’s say the following is our nested array −const arr = [ 'hello', [ 'world', 'how', [ 'are', 'you', [ 'without', 'me' ] ] ] ]; const arrayToString = (arr) => { let str = ''; for(let i = 0; i < arr.length; i++){ if(Array.isArray(arr[i])){ str += arrayToString(arr[i]); }else{ str += arr[i]; }; }; return str; }; console.log(arrayToString(arr));OutputFollowing is the output in the console −helloworldhowareyouwithoutme
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