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Articles on Trending Technologies
Technical articles with clear explanations and examples
Top tips to manage docker containers from command line
It’s true that the use of docker has skyrocketed in recent times and it will continue to increase in the coming years. Most organizations are now shifting their projects to docker containers if they have not already. Thus, only acquiring basic knowledge regarding creating and maintaining docker containers and images is not enough to keep up with the pace of such a huge technological shift.Managing a large number of containers and images through a single command line interface (CLI) seems to be a tedious task, but with proper set of management skills and hands-on experience with docker CLI commands, this ...
Read MoreProgram to find number of solutions in Quadratic Equation in C++
In this problem, we are given a quadratic equation of type ax2 + bx + c, where a, b and c are constants. Our task is to create a program to find number of solutions in Quadratic Equation in C++.Problem Description − Here, we need to find the numbers of solutions for a quadratic equation that can have at max 2 solutions.Let’s take a few examples to understand the problem, Example 1:Input − 3x2 + 7x + 4Output − 2Explanation − the two solutions of the equation are 1 and 4/3.Example 2:Input − x2 - 4x + 4Output − 1Explanation ...
Read MoreProgram to find number of squares in a chessboard in C++
In this problem, we are given the size of a chessboard. Our task is to create a program to find number of squares in a chessboard in C++.Problem Description − To find the number of squares in a chessboard. We will have to calculate all the combinations of the square that are inside the chessboard i.e. we will consider squares of side 1x1, 2x2, 3x3 … nxn.Let’s take an example to understand the problem, Input: n = 4.Output: 30Squares of size 1x1 -> 16 Squares of size 2x2 -> 9 Squares of size 3x3 -> 4 Squares of size 4x4 ...
Read MoreProgram to find Perimeter / Circumference of Square and Rectangle in C++
In this problem, we are given the side of a square (A) and the length and breadth of a rectangle (L and B). Our task is to create a Program to find Perimeter / Circumference of Square and Rectangle in C++.Problem Description:To find the circumference of a square, we need the side of the square (a). For that, we will use the formula for the perimeter of the square which is 4a.To find the circumference of a rectangle, we need the Length (L) and breadth (B) of the rectangle. For that, we will use the formula for the perimeter of ...
Read MoreHow to sort date array in JavaScript
Suppose we have an array that contains some dates like this −const arr = [ [ '02/13/2015', 0.096 ], [ '11/15/2013', 0.189 ], [ '05/15/2014', 0.11 ], [ '12/13/2013', 0.1285 ], [ '01/15/2013', 0.12 ], [ '01/15/2014', 0.11 ], [ '02/14/2014', 0.11 ], [ '03/14/2014', 0.11 ], [ '01/15/2015', 0.096 ], [ '07/15/2015', 0.096 ], [ '04/15/2013', 0.12 ], [ '04/15/2014', 0.11 ], [ '05/15/2013', 0.12 ], [ '06/14/2013', 0.12 ], [ '06/16/2014', 0.11 ], [ '07/15/2013', 0.12 ], [ '07/15/2014', 0.11 ], ...
Read MoreRecursive string parsing into object - JavaScript
We are required to write a JavaScript function that takes in an array of strings and returns an object corresponding to the strings.For example −If the array is −const arr = [ "country.UK.level.1", "country.UK.level.2", "country.US.level.1", "country.UK.level.3" ];Then the output should be −const output = { "country": [ {"UK" : {"level" : ["1", "2", "3"]}}, {"US" : {"level" : ["1", "2"]}} ] } ConditionsStrings stored in the str array will not be sorted and the code should be robust against that.Strings will follow the x.y.x.y... pattern, where x will be ...
Read MoreHow to join JavaScript array of string
We are required to write a JavaScript function that takes in an array of strings. The function should join all the strings of the array, replace all the whitespaces with dash "-", and return the string thus formed.For example: If the array is −const arr = ["QA testing promotion ", " Twitter ", "Facebook ", "Test"];Then the output should be −const output = "QA-testing-promotion-Twitter-Facebook-Test";ExampleFollowing is the code −const arr = ["QA testing promotion ", " Twitter ", "Facebook ", "Test"]; const joinArr = arr => { const arrStr = arr.join(''); let res = ''; for(let i = ...
Read MoreJavaScript Algorithm - Removing Negatives from the Array
Given an array X of multiple values (e.g. [-3, 5, 1, 3, 2, 10]), We are required to write a function that removes any negative values in the array.Once the function finishes its execution the array should be composed of just positive numbers. We are required to do this without creating a temporary array and only using pop method to remove any values in the array.ExampleFollowing is the code −// strip all negatives off the end while (x.length && x[x.length - 1] < 0) { x.pop(); } for (var i = x.length - 1; i >= 0; i--) { ...
Read MoreHow to find the biggest number in an array around undefined elements? - JavaScript
We are required to write a JavaScript function that takes in an array that contains some numbers, some strings and some falsy values.Our function should return the biggest Number from the array.For example −If the input array is the following with some undefined values −const arr = [23, 'hello', undefined, null, 21, 65, NaN, 1, undefined, 'hii'];Then the output should be 65ExampleFollowing is the code −const arr = [23, 'hello', undefined, null, 21, 65, NaN, 1, undefined, 'hii']; const pickBiggest = arr => { let max = -Infinity; for(let i = 0; i < arr.length; i++){ ...
Read MoreHow to select the middle of an array? - JavaScript
We are required to write a JavaScript function that takes in an array of Numbers.The function should return the middlemost element of the array.For example −If the array is −const arr = [1, 2, 3, 4, 5, 6, 7];Then the output should be 4ExampleFollowing is the code −const arr = [1, 2, 3, 4, 5, 6, 7]; const middle = function(){ const half = this.length >> 1; const offset = 1 - this.length % 2; return this.slice(half - offset, half + 1); }; Array.prototype.middle = middle; console.log(arr.middle()); console.log([1, 2, 3, 4, 5, 6].middle());OutputThis will produce the following output on console −[ 4 ] [ 3, 4 ]
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