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Web Development Articles
Page 31 of 801
Preparing numbers from jumbled number names in JavaScript
ProblemSuppose the following number name string −const str = 'TOWNE';If we rearrange this string, we can find two number names in it 2 (TWO) and 1 (ONE).Therefore, we expect an output of 21We are required to write a JavaScript function that takes in one such string and returns the numbers present in the string.ExampleFollowing is the code −const str = 'TOWNE'; const findNumber = (str = '') => { function stringPermutations(str) { const res = []; if (str.length == 1) return [str]; if (str.length == 2) return [str, str[1]+str[0]]; ...
Read MoreDisplaying likes on a post wherein array specifies the names of people that liked a particular post using JavaScript
ProblemWe are required to write a JavaScript function that takes in an array of names (string). This array specifies the names of people that liked a particular post on some social networking site.If the count of likes are less than or equal to three our function should simply return all names saying these people liked the post but if the count is greater than three then our function should return first two names and remaining count.ExampleFollowing is the code −const names = ['Ram', 'Manohar', 'Jay', 'Kumar', 'Vishal']; const displayLikes = (names) => { return [ 'no ...
Read MoreBoolean Gates in JavaScript
ProblemWe are required to write a JavaScript function that takes in an array of Boolean values and a logical operator.Our function should return a Boolean result based on sequentially applying the operator to the values in the array.ExampleFollowing is the code −const array = [true, true, false]; const op = 'AND'; function logicalCalc(array, op){ var result = array[0]; for(var i = 1; i < array.length; i++){ if(op == "AND"){ result = result && array[i]; } if(op == "OR"){ result = result || array[i]; } if(op == "XOR"){ result = result != array[i]; } } return result; } console.log(logicalCalc(array, op));Outputfalse
Read MoreReversing negative and positive numbers in JavaScript
ProblemWe are required to write a JavaScript function that takes in a number and returns its reversed number.One thing that we should keep in mind is that numbers should preserve their sign; i.e., a negative number should still be negative when reversed.ExampleFollowing is the code −const num = -224; function reverseNumber(n) { let x = Math.abs(n) let y = 0 while (x > 0) { y = y * 10 + (x % 10) x = Math.floor(x / 10) }; return Math.sign(n) * y }; console.log(reverseNumber(num));Output-422
Read MoreFinding nth element of an increasing sequence using JavaScript
ProblemConsider an increasing sequence which is defined as follows −The number seq(0) = 1 is the first one in seq.For each x in seq, then y = 2 * x + 1 and z = 3 * x + 1 must be in seq too.There are no other numbers in seq.Therefore, the first few terms of this sequence will be −[1, 3, 4, 7, 9, 10, 13, 15, 19, 21, 22, 27, ...]We are required to write a function that takes in a number n and returns the nth term of this sequence.ExampleFollowing is the code −const num = 10; ...
Read MoreReversing all alphabetic characters in JavaScript
ProblemWe are required to write a JavaScript function that takes in a string str. The job of our function is to reverse it, omitting all non-alphabetic characters.ExampleFollowing is the code −const str = 'exa13mple'; function reverseLetter(str) { const res = str.split('') .reverse() .filter(val => /[a-zA-Z]/.test(val)) .join(''); return res; }; console.log(reverseLetter(str));Outputelpmaxe
Read MoreCreating a binary spiral array of specific size in JavaScript
ProblemWe are required to write a JavaScript function that takes in a number n. Our function should construct and return an array of N * N order (2-D array), in which the 1s take all the spiralling positions starting from [0, 0] and all the 0s take non-spiralling positions.Therefore, for n = 5, the output will look like −[ [ 1, 1, 1, 1, 1 ], [ 0, 0, 0, 0, 1 ], [ 1, 1, 1, 0, 1 ], [ 1, 0, 0, 0, 1 ], [ 1, 1, 1, 1, 1 ] ]ExampleFollowing ...
Read MoreFinding sum of remaining numbers to reach target average using JavaScript
ProblemWe are required to write a JavaScript function that takes in an array of numbers and a single number.Our function should find that very number which should be pushed to the array so that its average equals the number specified by the second argument.ExampleFollowing is the code −const arr = [4, 20, 25, 17, 9, 11, 15]; const target = 25; function findNumber(arr, target) { let sum = arr.reduce((a, b) => a + b, 0); let avg = sum / arr.length; let next = Math.ceil((target * (arr.length + 1)) - sum); if (next
Read MoreIsosceles triangles with nearest perimeter using JavaScript\\n
Almost Isosceles TriangleAn Almost Isosceles Integer Triangle is a triangle that all its side lengths are integers and also, two sides are almost equal, being their absolute difference 1 unit of length.ProblemWe are required to write a JavaScript function that takes in a number which specifies the perimeter of a triangle.Our function should find the measurement of such an almost isosceles triangle whose perimeter is nearest to the input perimeter.For example, if the desired perimeter is 500, Then the almost isosceles triangle with the nearest perimeter will be − [105, 104, 181]ExampleFollowing is the code −const perimeter = 500; const ...
Read MoreDetermining sum of array as even or odd in JavaScript
ProblemWe are required to write a JavaScript function that takes in an array of integers arr. Our function should return the string ‘odd’ if the sum of all the elements of the array is odd or ‘even’ if it’s even.ExampleFollowing is the code −const arr = [5, 1, 8, 4, 6, 9]; const assignSum = (arr = []) => { const sum = arr.reduce((acc, val) => { return acc + val; }, 0); const isSumEven = sum % 2 === 0; return isSumEven ? 'even' : 'odd'; }; console.log(assignSum(arr));OutputFollowing is the console output −odd
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