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We are required to write a function that takes in two strings, we have to return a new string which is just the same as the first of the two arguments but have second argument prepended to its every word.For example −Input → ‘hello stranger, how are you’, ‘@@’ Output → ‘@@hello @@stranger, @@how @@are @@you’If second argument is not provided, take ‘#’ as default.Exampleconst str = 'hello stranger, how are you'; const prependString = (str, text = '#') => { return str .split(" ") .map(word => `${text}${word}`) .join(" "); }; console.log(prependString(str)); console.log(prependString(str, '43'));OutputThe ... Read More
We are required to write a function that removes duplicate objects from an array and returns a new one. Consider one object the duplicate of other if they both have same number of keys, same keys and same value for each key.Let’s write the code for this −We will use a map to store distinct objects in stringified form and once we see a duplicate key we omit it otherwise we push the object into the new array −Exampleconst arr = [ { "timestamp": 564328370007, "message": "It will rain today" }, ... Read More
We are required to write a function that takes in a string, trims it off any whitespaces, converts it to lowercase and returns an array of numbers describing corresponding characters positions in the english alphabets, any whitespace or special character within the string should be ignored.For example −Input → ‘Hello world!’ Output → [8, 5, 12, 12, 15, 23, 15, 18, 12, 4]The code for this will be −Exampleconst str = 'Hello world!'; const mapString = (str) => { const mappedArray = []; str .trim() .toLowerCase() .split("") .forEach(char => { const ascii = char.charCodeAt(); if(ascii >= 97 && ascii
Let’s say, we are required to write a function that takes an array as input and returns the maximum slice of the array which contains no more than two different numbers. If we closely examine this problem this involves checking for a stable sub array and iterating over the original array.Therefore, the sliding window algorithm is very suitable for this. The code for solving this problem via sliding window algorithm will be −Exampleconst arr = [1, 1, 1, 2, 2, 2, 1, 1, 2, 2, 6, 2, 1, 8, 1, 1 ,1 ,1, 8, 1, 1, 8, 8]; const map ... Read More
We are required to write a function, say isEqual() that takes in two strings as argument and checks if they both contains the same characters independent of their order and case.For example −const first = 'Aavsg'; const second = 'VSAAg'; isEqual(first, second); //trueMethod: 1 Using arraysIn this method we convert the strings into arrays, make use of the Array.prototype.sort() method, convert them back into strings and check for equality.The code for this will be −Exampleconst first = 'Aavsg'; const second = 'VSAAg'; const stringSort = function(){ return this.split("").sort().join(""); } String.prototype.sort = stringSort; const isEqual = (first, second) => first.toLowerCase().sort() ... Read More
Let’s say we have the following array of objects −const people = [{ firstName: 'Ram', id: 301 }, { firstName: 'Shyam', lastName: 'Singh', id: 1016 }, { firstName: 'Dinesh', lastName: 'Lamba', id: 231 }, { id: 341 }, { firstName: 'Karan', lastName: 'Malhotra', id: 441 }, { id: 8881 }, { firstName: 'Vivek', id: 301 }];We are required to sort this array so that the object with both firstName and lastName property appears first then the objects with firstName or lastName and lastly the objects ... Read More
We are given an array of numbers and a number; our job is to write a function that returns an array of all the sub arrays which add up to the number provided as second argument.For example −const arr = [23, 5, 1, 34, 12, 67, 9, 31, 6, 7, 27]; const sum = 40; console.log(requiredSum(arr, sum));Should output the following array −[ [ 5, 1, 34 ], [ 9, 31 ], [ 6, 7, 27 ] ]Because each of these 3 sub arrays add up to 40.The Sliding Window Algorithm (Linear Time)This algorithm is mostly used when we are required ... Read More
We are given a months array, which elements less than 12, where each element will be between 1 and 12 (both inclusive). Our job is to take this array and create a full months array with 12 elements, if the element is present in the original array we use that element otherwise we use at that place.For example −Intput → [5, 7, 9] Output → [0, 0, 0, 0, 5, 0, 7, 0, 9, 10, 0, 0]Now, let’s write the code −Exampleconst months = [6, 7, 10, 12]; const completeMonths = (arr) => { const completed = []; for(let i = 1; i
In data analysis, sometimes we need to use zeros for certain calculations, either to nullify the effect of a variable or for some other purpose based on the objective of the analysis. To deal with such type of situations, we need a zero value or a vector of zeros. There are many ways to create a vector with zeros in R. The important thing is the length of the vector.Examples> x1 x1 [1] 0 0 0 0 0 0 0 0 0 0 > x2 x2 [1] 0 0 0 0 0 0 0 0 0 0 0 0 0 ... Read More
Binding is a process to set values for the parameters when Web API calls a controller action method.Web API methods with the different types of the parameters and how to customize the binding process.If the parameter is a simple type like int, bool, double, etc., Web API tries to get the value from the URI (Either from route data or from the Query String)if the parameter is a complex type like Customer, Employee, etc., then the Web API Framework tries to get the value from the request body.We can change this default behavior of the parameter binding process by using ... Read More