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Google Apps Scripts and Web Development Tutorials and Resources by Laurence Svekis
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
JavaScript interview questions with code examples: What is hoisting in JavaScript and how does it work? console.log(hoistedVariable); // undefined var hoistedVariable = ‘This is a hoisted variable’; console.log(notHoisted); // ReferenceError: notHoisted is not defined let notHoisted = ‘This is not a hoisted variable’; What is closure in JavaScript and how is it useful? function outerFunction(x) … Read more
JavaScript interview questions with answers: What is closure in JavaScript and how does it work? Answer: Closure is a feature in JavaScript where a function has access to its outer scope even after the outer function has returned. It is created when a function is defined inside another function, and the inner function retains access … Read more
JSON.stringify JSON.stringify is a method in JavaScript used to convert a JavaScript object into a JSON string. JSON stands for JavaScript Object Notation and is a lightweight data interchange format used for exchanging data between systems. Here are some examples of using JSON.stringify: Converting a JavaScript object to a JSON string: const person = { … Read more
A template literal in JavaScript is a type of string literal that allows for embedded expressions, represented by expressions inside ${}. They are indicated by using backticks (“) instead of quotes (” or ‘). Example: const name = “John”; const sentence = `Hello, my name is ${name}.`; console.log(sentence); // Output: “Hello, my name is John.” … Read more
The JavaScript Document Object Model (DOM) is a programming interface for HTML and XML documents. It represents the structure of a document as a tree of objects, with each object (or “node”) representing a part of the document, such as an element, an attribute, or text content. The DOM allows developers to access and manipulate … Read more