Coding Help Tips Resources Tutorials
Google Apps Scripts and Web Development Tutorials and Resources by Laurence Svekis
Explain the event delegation in JavaScript. Event delegation is a technique in JavaScript where instead of attaching an event handler to each individual element, you attach a single event handler to a parent element and handle the events of its child elements through event bubbling. This approach has several benefits, such as improved performance, reduced … Read more
What is hoisting in JavaScript? Hoisting is a JavaScript behavior where variable and function declarations are moved to the top of their containing scope during the compilation phase, before the code is executed. This means that regardless of where variables and functions are declared in the code, they are treated as if they were declared … Read more
What are the differences between var, let, and const? In JavaScript, var, let, and const are used to declare variables, but they have different scoping rules and behaviors. Here’s a detailed explanation of the differences between them: var: Variables declared with var are function-scoped or globally-scoped. They are hoisted to the top of their scope, … Read more
In JavaScript, null and undefined are both special values that represent the absence of a value. However, they have different use cases and behaviors. Here’s a detailed explanation of the difference between null and undefined: undefined: undefined is a primitive value in JavaScript. It is used to indicate the absence of an assigned value to … Read more
What are the different data types in JavaScript? JavaScript has several built-in data types that are used to represent different kinds of values. Here are the different data types in JavaScript: Number: Represents numeric values. It can be an integer or a floating-point number. For example: var age = 25; var temperature = 98.6; String: … Read more
In JavaScript, you can make an HTTP request using the XMLHttpRequest object or the newer fetch() function. Here’s an example of how to make an HTTP GET request using both methods: Using XMLHttpRequest: var xhr = new XMLHttpRequest(); xhr.open(“GET”, “https://api.example.com/data”, true); xhr.onreadystatechange = function() { if (xhr.readyState === 4 && xhr.status === 200) { var … Read more
You can use the FormData API in JavaScript. Here’s an example of how you can serialize form data: function serializeFormData(form) { var formData = new FormData(form); var serializedData = {}; for (var [name, value] of formData) { if (serializedData[name]) { if (!Array.isArray(serializedData[name])) { serializedData[name] = [serializedData[name]]; } serializedData[name].push(value); } else { serializedData[name] = value; } … Read more
The code defines two functions, addToStorage() and viewStorage(), that interact with the localStorage object in the browser. The addToStorage() function retrieves the values entered in two form fields using the getElementById() method, and creates an object called myObj with these values as properties. It then logs this object to the console using console.log(). Next, the … Read more
Using == instead of ===Not using const and letNot using semicolonsNot handling errorsNot using strict modeNot using curly bracesNot using Array.prototype.forEach()Not using const when defining functionsNot using the let keyword in for loopsNot using === or !== with null or undefined Using == instead of === Using == instead of === can lead to unexpected … Read more
top 10 coding mistakes with JavaScript and how to avoid them: #javascript #learnjavascript #javascripttutorial #javascriptbeginner #javascriptintermediate #javascriptadvanced #javascripttips #javascripttricks #javascriptcode #javascriptproblems #javascriptchallenges #javascriptdom #javascriptajax #javascriptjquery #javascriptnode #javascriptreact #javascriptangular 1. Not declaring variables. When a variable is not declared, it is considered a global variable. This means that it can be accessed from anywhere in the … Read more