Coding Help Tips Resources Tutorials
Google Apps Scripts and Web Development Tutorials and Resources by Laurence Svekis
JavaScript Coding Exercises JavaScript coding exercise that involves working with arrays and string manipulation: Exercise: Write a function that takes in an array of words and returns a new array containing only the words that have all their letters in alphabetical order. Example: const words = [‘hello’, ‘world’, ‘abcedf’, ‘goodbye’]; console.log(wordsInOrder(words)); // [‘abcedf’] Explanation: To … Read more
JavaScript DOM Code Examples What is the DOM in JavaScript and how can we access it? The Document Object Model (DOM) is a programming interface for web documents. It represents the page so that programs can change the document structure, style, and content. We can access the DOM using JavaScript’s document object. Here’s an example: … Read more
JavaScript DOM Examples What is the DOM? Explain the concept of the DOM hierarchy. Solution: The Document Object Model (DOM) is a cross-platform and language-independent application programming interface that treats an HTML, XHTML, or XML document as a tree structure where each node represents a part of the document. In simple terms, it is an … Read more
10 JavaScript interview questions with solutions and code How do you check if a variable is an array? Solution: function isArray(variable) { return Array.isArray(variable); } What is the difference between null and undefined in JavaScript? Solution: null is an intentional absence of any object value and is often used to indicate a deliberate non-value. undefined … Read more
Guide to JavaScriptJavaScript is a high-level, dynamic, and interpreted programming language. It is used to add interactivity and other dynamic elements to websites. The console in JavaScriptVariables:JavaScript CommentsData Types:JavaScript Data TypesArithmetic Operations:Conditional Statements:Functions:JavaScript Loops:JavaScript ArraysJavaScript ObjectsHow to output a table into the consoleJavaScript String MethodsJavaScript Number MethodsJavaScript MathVariables:Arrays:Example : ArrayExample: ObjectObjects:Conditional Statements:Functions:Example: Simple FunctionExample: Conditional … Read more
Top 10 Coding Examples and Tips for JavaScript Code Use spread operator Use spread operator to combine arrays: const a = [1, 2, 3]; const b = [4, 5, 6]; const c = […a, …b]; // [1, 2, 3, 4, 5, 6] Use spread operator to combine arrays: The spread operator (…) can be used … Read more
Top 10 Coding Examples and Tips for JavaScript Code strict mode example Use strict mode to enforce modern JavaScript syntax and catch errors early: ‘use strict’; Use const and let Always declare variables with const or let, rather than var: // Use let let name = ‘John Doe’; // Use const const PI = 3.14; … Read more
JavaScript Common Interview Questions and Solutions Coding Examples Closure 2forEach Array 3JavaScript Map function 3JavaScript Filter 4Check if number is an integer 5Is the string a palindrome 6Reverse a String 6Find the largest number in an array 8Check Object Property 8Common Elements in two Arrays 9 ClosureWhat is closure in JavaScript and give an example … Read more
JavaScript Async Code Examples JavaScript is a single-threaded language, which means that it can only execute one piece of code at a time. This can make it challenging to perform long-running tasks, such as network requests, without freezing up the UI. To solve this issue, JavaScript provides the concept of asynchronous programming, which allows you … Read more
10 best practices for writing efficient and maintainable JavaScript code: Use const instead of var or let whenever possible. This helps prevent accidental modification of variables. Example: const name = “John”; name = “Jane”; // Error: “name” is read-only Declare variables as close as possible to their first use. This reduces their scope and makes … Read more