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Javascript Articles
Page 389 of 534
Splitting last n digits of each value in the array in JavaScript
We have an array of literals like this −const arr = [56768, 5465, 5467, 3, 878, 878, 34435, 78799];We are required to write a JavaScript function that takes in this array and a number n and if the corresponding element contains more than or equal to n characters, then the new element should contain only the last n characters otherwise the element should be left as it is.Therefore, if n = 2, for this array, the output should be −const output = [68, 65, 67, 3, 78, 78, 35, 99];ExampleFollowing is the code −const arr = [56768, 5465, 5467, 3, 878, 878, 34435, 78799]; const splitLast = (arr, num) => { return arr.map(el => { if(String(el).length
Read MoreMatching strings for similar characters - JavaScript
We are required to write a JavaScript function that accepts two string and a number n.The function matches the two strings i.e., it checks if the two strings contains the same characters.The function returns true if both the strings contain the same character irrespective of their order or if they contain at most n different characters, else the function should return false.ExampleFollowing is the code −const str = 'some random text'; const str2 = 'some r@ndom text'; const deviationMatching = (first, second, num) => { let count = 0; for(let i = 0; i < first.length; i++){ ...
Read MoreFunction that parses number embedded in strings - JavaScript
Conventionally, we have functions like parseInt() and parseFloat() that takes in a string and converts the number string to Number. But these methods fail when we have numbers embedded at random index inside the string.For example: The following would only return 454, but what we want is 4545453 −parseInt('454ffdg54hg53')So, we are required to write a JavaScript function that takes in such string and returns the corresponding number.ExampleFollowing is the code −const numStr = '454ffdg54hg53'; const parseInteger = numStr => { let res = 0; for(let i = 0; i < numStr.length; i++){ if(!+numStr[i]){ ...
Read MoreHow to access variables declared in a function, from another function using JavaScript?
We have to write a function, that does some simple task, say adding two numbers or something like that. We are required to demonstrate the way we can access the variables declared inside that function in some other function or globally.ExampleFollowing is the code −const num = 5; const addRandomToNumber = function(num){ // a random number between [0, 10) const random = Math.floor(Math.random() * 10); // assigning the random to this object of function // so that we can access it outside this.random = random; this.res = num + random; }; const addRandomInstance = ...
Read MoreIf ([] == false) is true, why does ([] || true) result in []? - JavaScript
If we look closely at the problem statement, the difference between ([] == false) and ([] || true) is the following −In the first case, we are using loose conditional checking, allowing type coercion to take over.While in the second case, we are evaluating [] to its respective Boolean (truthy or falsy) which makes use of the function Boolean() instead of type coercion under the hook.Let's now unveil the conversions that happens behind the scenes in both cases.Case 1 − ([] == false)According to the MDN docs if two data types say x and y are compared using the loose ...
Read MoreSorting or Arranging an Array with standard array values - JavaScript
We are required to sort a dynamic JavaScript array. The condition is that we are required to sort it according to the values stored in a particular order in a standard predefined array.Let’s say the following is our dynamic array −const dbArray = ['Apple', 'Banana', 'Mango', 'Apple', 'Mango', 'Mango', 'Apple'];And suppose the standard array against which we have to sort the above array is like −const stdArray = ['Mango', 'Apple', 'Banana', 'Grapes'];So, after sorting the dbArray, my resultant array should look like −const resultArray = ['Mango', 'Mango', 'Mango', 'Apple', 'Apple', 'Apple', 'Banana'];ExampleFollowing is the code −const dbArray = ['Apple', 'Banana', ...
Read MoreFinding letter distance in strings - JavaScript
We are required to write a JavaScript function that takes in a string as first argument and two single element strings. The function should return the distance between those single letter stings in the string taken as first argument.For example −If the three strings are −const str = 'Disaster management'; const a = 'i', b = 't';Then the output should be 4 because the distance between 'i' and 't' is 4ExampleFollowing is the code −const str = 'Disaster management'; const a = 'i', b = 't'; const distanceBetween = (str, a, b) => { const aIndex = str.indexOf(a); ...
Read MoreFinding shared element between two strings - JavaScript
We are required to write a JavaScript function that takes in two strings that may / may not contain some common elements. The function should return an empty string if no common element exists otherwise a string containing all common elements between two strings.Following are our two strings −const str1 = 'Hey There!!, how are you'; const str2 = 'Can this be a special string';ExampleFollowing is the code −const str1 = 'Hey There!!, how are you'; const str2 = 'Can this be a special string'; const commonString = (str1, str2) => { let res = ''; for(let i ...
Read MoreAdding a function for swapping cases to the prototype object of strings - JavaScript
In JavaScript, we can write our own custom functions and assign them to the existing standard data types (it is quite similar to writing library methods but in this case the data types are primitive and not user defined. We are required to write a JavaScript String function by the name, let’s say swapCase().This function will return a new string with all uppercase characters swapped for lower case characters, and vice versa. Any non-alphabetic characters should be kept as they are.ExampleFollowing is the code −const str = 'ThIS iS A CraZY StRInG'; String.prototype.swapCase = function(){ let res = ''; ...
Read MoreMapping the letter of a string to an object of arrays - JavaScript
Given a string, we are required to write a function that creates an object that stores the indexes of each letter in an array. The letters (elements) of the string must be the keys of objectThe indexes should be stored in an array and those arrays are values.For example −If the input string is −const str = 'cannot';Then the output should be −const output = { 'c': [0], 'a': [1], 'n': [2, 3], 'o': [4], 't': [5] };ExampleFollowing is the code −const str = 'cannot'; const mapString = str => { const map = ...
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