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Javascript Articles
Page 431 of 534
Loop through array and edit string JavaScript
Let’s say, we have to write a function, say translate() that accepts a string as the first argument and any number of words after that.The string will actually contain n $ signs like this −This $0 is more $1 just a $2. Then there will be 3 strings which will replace the corresponding places.For example −If the function call is like this −translate(‘This $0 is more $1 just a $2.’, ‘game’, ‘than’, ‘game’);The output of the function should be −This game is more than just a game.This functionality is more or less like the template injecting in JavaScript.Therefore, let’s write ...
Read MoreWrite an algorithm that takes an array and moves all of the zeros to the end JavaScript
We have to write a function that takes in an array and moves all the zeroes present in that array to the end of the array without using any extra space. We will use the Array.prototype.forEach() method here along with Array.prototype.splice() and Array.prototype.push().The code for the function will be −Exampleconst arr = [34, 6, 76, 0, 0, 343, 90, 0, 32, 0, 34, 21, 54]; const moveZero = (arr) => { for(ind = 0; ind < arr.length; ind++){ const el = arr[ind]; if(el === 0){ arr.push(arr.splice(ind, 1)[0]); ind--; }; } }; moveZero(arr); console.log(arr);OutputThe output in the console will be −[34, 6, 76, 343, 90, 32, 34, 21, 54, 0, 0, 0, 0]
Read MoreRecursive product of summed digits JavaScript
We have to create a function that takes in any number of arguments (Number literals), adds them together, and returns the product of digits when the answer is only 1 digit long.For example −If the arguments are −16, 34, 42We have to first add them together −16+34+42 = 92And then keep multiplying the digits together until we get a 1-digit number like this −9*2 = 18 1*8 = 8When we get the one-digit number, we have to return it from our function.We will break this into two functions −One function accepts a number and returns the product of its digits, ...
Read MoreJavaScript code for recursive Fibonacci series
We have to write a recursive function fibonacci() that takes in a number n and returns an array with first n elements of fibonacci series. Therefore, let’s write the code for this function −Exampleconst fibonacci = (n, res = [], count = 1, last = 0) => { if(n){ return fibonacci(n-1, res.concat(count), count+last, count); }; return res; }; console.log(fibonacci(8)); console.log(fibonacci(0)); console.log(fibonacci(1)); console.log(fibonacci(19));OutputThe output in the console will be −[ 1, 1, 2, 3, 5, 8, 13, 21 ] [] [ 1 ] [ 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181 ]
Read MoreGet the longest and shortest string in an array JavaScript
We have an array of string literals like this −const arr = ['Some', 'random', 'words', 'that', 'actually', 'form', 'a', 'sentence.'];We are required to write a function that returns the longest and the shortest word from this array. We will use Array.prototype.reduce() method to keep track of the longest and shortest word in the array through a complete iteration.The code for this will be −Exampleconst arr = ['Some', 'random', 'words', 'that', 'actually', 'form', 'a', 'sentence.']; const findWords = (arr) => { return arr.reduce((acc, val) => { const { length: len } = val; if(len ...
Read MoreSum of consecutive numbers in JavaScript
Let’s say, we have to write a function that takes in an array and returns another array in which the consecutive similar numbers are added up together.For example −const array = [1, 5, 5, 5, 8, 8, 9, 1, 4, 4, 2];The output should be −[1, 15, 16, 9, 1, 8, 2]All consecutive 5s added up to 15, then 2 consecutive 8s added up to 16 similarly 4s added up to 8.Therefore, let’s write the code for this function. We will use the Array.prototype.reduce() method here to reduce the original array and simultaneously construct a new one.Exampleconst array = [1, ...
Read MoreRecursively loop through an array and return number of items with JavaScript?
We have to write a function, say searchRecursively() that takes in an array and a search query and returns the count of that search query in the nested array.For example, if the array is given by −const names = ["rakesh", ["kalicharan", "krishna", "rakesh", "james", ["michael", "nathan", "rakesh", "george"]]];Then −searchRecursively(names, ‘’rakesh’);Should return 3 because it makes a total of 3 appearances in the array. Therefore, let’s write the code for this recursive function −Exampleconst names = ["rakesh", ["kalicharan", "krishna", "rakesh", "james", ["michael", "nathan", "rakesh", "george"]]]; const searchRecursively = (arr, query, count = 0, len = 0) => { if(len < ...
Read MoreJavaScript program to merge two objects into a single object and adds the values for same keys
We have to write a function that takes in two objects, merges them into a single object, and adds the values for same keys. This has to be done in linear time and constant space, means using at most only one loop and merging the properties in the pre-existing objects and not creating any new variable.So, let’s write the code for this function −Exampleconst obj1 = { value1: 45, value2: 33, value3: 41, value4: 4, value5: 65, value6: 5, value7: 15, }; const obj2 = { value1: 34, value3: 71, ...
Read MoreHow to check existence of NaN keyword in an array JavaScript
We have an array of elements that contains both truth and false values. Our job is to write a function that returns an array with indices of those elements which are NaN in the original array.NaN !== NaNThe datatype of NaN is actually number. Although NaN is a falsy value, it has a peculiar property that no other datatype or variable has. It’s that the expression NaN === NaN yields false. And it’s only in the case of NaN that its false.So, we can use this behavior to our good and pick out NaN value index. The code for this ...
Read MoreOrder items alphabetically apart from certain words JavaScript
Let’s say, we have two arrays both containing String literals, one of which is required to sort alphabetically, but if this array, the one we have to sort contains some words from the other array, those words should appear at the very top and the rest of the element should be sorted alphabetically.Let’s write a function, say excludeSorting(arr, ex) where arr is the array to be sorted and ex is the array of strings that should appear at top in arr (if they appear in arr).Exampleconst arr = ['apple', 'cat', 'zebra', 'umbrella', 'disco', 'ball', 'lemon', 'kite', 'jack', 'nathan']; const toBeExcluded ...
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