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We are required to write a JavaScript function that takes in two numbers, say m and n, and it returns an array of first n multiples of m.Therefore, let’s write the code for this function −ExampleThe code for this will be −const num1 = 4; const num2 = 6; const multiples = (num1, num2) => { const res = []; for(let i = num1; i
Suppose, we have an array of literals like this −const arr = [3, 5, 5, 2, 23, 4, 7, 8, 8, 9];We are required to write a JavaScript function that takes in this array and a number, say n, and returns an object representing the count of elements greater than and smaller than n.Therefore, let’s write the code for this function −ExampleThe code for this will be −const arr = [3, 5, 5, 2, 23, 4, 7, 8, 8, 9]; const smallerLargerNumbers = (arr, num) => { return arr.reduce((acc, val) => { let { greater, smaller ... Read More
We are required to write a JavaScript function that counts all unique items in an array. The function should return an object representing the count of each unique element of the array.Therefore, let’s write the code for this function −ExampleThe code for this will be −const arr = ["hi", "hello", "hi"]; const countUnique = arr => { const counts = {}; for (var i = 0; i < arr.length; i++) { counts[arr[i]] = 1 + (counts[arr[i]] || 0); }; return counts; }; console.log(countUnique(arr));OutputThe output in the console will be −{ hi: 2, hello: 1 }
Suppose we have an array like this −const arr = [2, 42, 82, 122, 162, 202, 242, 282, 322, 362];We are required to write a JavaScript function that takes in one such array and a number, say n.The function should return the index of item from the array which is closest to the number n.Therefore, let’s write the code for this function −ExampleThe code for this will be −const arr = [2, 42, 82, 122, 162, 202, 242, 282, 322, 362]; const closestIndex = (num, arr) => { let curr = arr[0], diff = Math.abs(num - curr); let ... Read More
In this post, we will go through the options handling large CSV files with Pandas.CSV files are common containers of data, If you have a large CSV file that you want to process with pandas effectively, you have a few options.Pandas is an in−memory toolYou need to be able to fit your data in memory to use pandas with it. If you can process portions of it at a time, you can read it into chunks and process each chunk. Alternatively, if you know that you should have enough memory to load the file, there are a few hints to ... Read More
We are required to write a JavaScript function that should repeat the even number inside the same array.For example, given the following array −const arr = [1, 2, 5, 6, 8];OutputWe should get the output −const output = [1, 2, 2, 5, 6, 6, 8, 8];Therefore, let’s write the code for this function −ExampleThe code for this will be −const arr = [1, 2, 5, 6, 8]; const repeatEvenNumbers = arr => { let end = arr.length -1; for(let i = end; i > 0; i--){ if(arr[i] % 2 === 0){ arr.splice(i, 0, arr[i]); }; }; return arr; }; console.log(repeatEvenNumbers(arr));OutputThe output in the console will be −[ 1, 2, 2, 5, 6, 6, 8, 8 ]
Given a sequence of integers as an array, determine whether it is possible to obtain a strictly increasing sequence by removing no more than one element from the array.Note: sequence a0, a1, ..., an is considered to be strictly increasing if a0 < a1 < ... < an. Sequences containing only one element are also considered to be strictly increasing.Example, for sequence = [1, 3, 2, 1], the output should be −almostIncreasingSequence(sequence) = false.There is no one element in this array that can be removed in order to get a strictly increasing sequence.For sequence = [1, 3, 2], the output ... Read More
Suppose we have an array like this −const arr = [ [1, 2, 3, 4], [12, 13, 14, 5], [11, 16, 15, 6], [10, 9, 8, 7] ];The array is bound to be a square matrix.We are required to write a JavaScript function that takes in this array and constructs a new array by taking elements and spiraling in until it converges to center. A snail trail spiraling around the outside of the matrix and inwards.Therefore, the output for the above array should be −const output = [1, 2, 3, 4, 5, 6, 7, 8, 9, ... Read More
Suppose, we have an array and objects like these −Objects:const main = [ {name: "Karan", age: 34}, {name: "Aayush", age: 24}, {name: "Ameesh", age: 23}, {name: "Joy", age: 33}, {name: "Siddarth", age: 43}, {name: "Nakul", age: 31}, {name: "Anmol", age: 21}, ];Array:const names = ["Karan", "Joy", "Siddarth", "Ameesh"];We are required to write a JavaScript function that takes in two such arrays and filters the first array in place to contain only those objects whose name property is included in the second array.Therefore, let’s write the code for this function −ExampleThe code for this ... Read More
We are required to write a JavaScript function that takes in a string that represents a number.Replace the leading zero with spaces in the number. Make sure the prior spaces in number are retained.For example: If the string value is defined as −"004590808"Then the output should come as −"4590808"ExampleThe code for this will be −const str = ' 004590808'; const replaceWithSpace = str => { let replaced = ''; const regex = new RegExp(/^\s*0+/); replaced = str.replace(regex, el => { const { length } = el; return ' '.repeat(length); }); return replaced; }; console.log(replaceWithSpace(str));OutputThe output in the console will be −4590808