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Articles on Trending Technologies
Technical articles with clear explanations and examples
Ternary Operator in Dart Programming
The ternary operator is a shorthand version of an if-else condition. There are two types of ternary operator syntax in Dart, one with a null safety check and the other is the same old one we encounter normally.Syntax 1condition ? expressionOne : expressionTwo;The above syntax implies that if a certain condition evaluates to true then we evaluate the expressionOne first and then the expressionTwo.ExampleLet's explore a Dart example where we make use of the above syntax of the ternary operator.Consider the example shown below −void main(){ var ans = 10; ans == 10 ? print("Answer is 10") : ...
Read MoreFinding sum of sequence upto a specified accuracy using JavaScript
ProblemSuppose the following sequence:Seq: 1/1 , 1/1x2 , 1/1x2x3 , 1/1x2x3x4 , ....The nth term of this sequence will be −1 / 1*2*3 * ... nWe are required to write a JavaScript function that takes in a number n, and return the sum of first n terms of this sequence.ExampleFollowing is the code −const num = 12; const seriesSum = (num = 1) => { let m = 1; let n = 1; for(let i = 2; i < num + 1; i++){ m *= i; n += (m * -1); }; return n; }; console.log(seriesSum(num));Output-522956311
Read MoreC Program to build DFA accepting the languages ending with “01”
ProblemDesign deterministic finite automata (DFA) with ∑ = {0, 1} that accepts the languages ending with “01” over the characters {0, 1}.SolutionThe strings that are generated for a given language are as follows −L={01, 001, 101, 110001, 1001, ……….}The minimum length of the string is 2, the number of states that the DFA consists of for the given language is: 2+1 = 3 states.Here, q0 − On input 0 it goes to state q1 and on input 1 it goes to itself.q1 − On input 0 it goes to itself and on input 1 it goes to State q2.q2 − ...
Read MoreConsecutive Nth column Difference in Tuple List using Python
When it is required to find the consecutive column difference in a list of tuple, it can be iterated over, and the ‘abs’ method and the ‘append’ method can be used.The ‘abs’ method returns the absolute or positive value, and the append adds elements to a list.Below is a demonstration of the same −Examplemy_list = [(67, 89, 32), (11, 23, 44), (65, 75, 88)] print("The list is : ") print(my_list) print("The value of k has been initialized") K = 1 my_result = [] for idx in range(0, len(my_list) - 1): my_result.append(abs(my_list[idx][K] - my_list[idx + 1][K])) ...
Read MoreFinding all peaks and their positions in an array in JavaScript
Build UpSuppose we have the following array in JavaScript −const arr = [4, 3, 4, 7, 5, 2, 3, 4, 3, 2, 3, 4];If we plot the points of this array on y-axis with each adjacent point being unit distance away on x-axis, the graph will look like this −This graph clearly shows that there exist two local maxima (peaks) in this array at index 3 and 7 with values 7 and 4 respectively.ProblemWe are required to write a JavaScript function that takes in an array of integers, arr, as the first and the only argument.Our function is supposed to ...
Read MoreThis keyword in Dart Programming
This keyword in dart is used to remove the ambiguity that can be caused if the class attributes and the parameters have the same name. This keyword basically represents an implicit object pointing to the current class object.We usually prefix the class attribute with this keyword whenever we want to remove the ambiguity between the class attributes and the parameters.ExampleLet's take two examples of the case where the name of the class attribute and the parameters are the same.Consider the example shown below −void main() { Employee emp = new Employee('001'); emp.empCode = '111'; } class Employee ...
Read MorePython program to Sort Tuples by their Maximum element
When it is required to sort the tuples based on the maximum element in it, a method is defined that uses the ‘max’ method to return the highest element.Next the ‘sort’ method can be used to sort the list based on the previously defined function.Below is a demonstration of the same −Exampledef get_max_value(my_val): return max(my_val) my_list = [(4, 6, 8, 1), (13, 21, 42, 56), (7, 1, 9, 0), (1, 2)] print(“The list is : “) print(my_list) my_list.sort(key = get_max_value, reverse = True) print(“The sorted tuples are : “) print(my_list)OutputThe list is : [(4, 6, 8, ...
Read MoreRemoving comments from array of string in JavaScript
ProblemWe are required to write a JavaScript function that takes in array of strings, arr, as the first argument and an array of special characters, starters, as the second argument.The starter array contains characters that can start a comment. Our function should iterate through the array arr and remove all the comments contained in the strings.For example, if the input to the function is:const arr = [ 'red, green !blue', 'jasmine, #pink, cyan' ]; const starters = ['!', '#'];Then the output should be −const output= [ 'red, green', 'jasmine, ' ];ExampleFollowing is the code −const arr ...
Read MorePython program to find tuples which have all elements divisible by K from a list of tuples
When it is required to find tuples that have elements that are divisible by a specific element ‘K’, the list comprehension can be used.Below is a demonstration of the same −Examplemy_list = [(45, 90, 135), (71, 92, 26), (2, 67, 98)] print("The list is : ") print(my_list) K = 45 print("The value of K has been initialized to ") print(K) my_result = [sub for sub in my_list if all(ele % K == 0 for ele in sub)] print("Elements divisible by K are : " + str(my_result))OutputThe list is : [(45, 90, 135), (71, 92, 26), (2, 67, ...
Read MorePython program to find Tuples with positive elements in List of tuples
When it is required to find tuples that have position elements from a list of tuples, list comprehension can be used.Below is a demonstration of the same −Examplemy_list = [(56, 43), (-31, 21, 23), (51, -65, 26), (24, 56)] print("The list is : ") print(my_list) my_result = [sub for sub in my_list if all(elem >= 0 for elem in sub)] print("The positive elements are : ") print(my_result)OutputThe list is : [(56, 43), (-31, 21, 23), (51, -65, 26), (24, 56)] The positive elements are : [(56, 43), (24, 56)]ExplanationA list of tuples is defined, and is displayed ...
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