Gathering sand into a tower, making a little progress every day
⭐ Column introduction
Front-end entry journey: Explore the wonderful world of web development. Remember to click on the link above or on the right to subscribe to this column. Geometry will take you on a front-end journey.
Welcome to the front-end entry journey! This column is tailor-made for those who are interested in web development and have just entered the front-end field. Whether you are a complete novice or a developer with some basic knowledge, here will provide you with a systematic and friendly learning platform. In this column, we will update it every day in the form of questions and answers, presenting you with selected front-end knowledge points and answers to frequently asked questions. Through the Q&A format, we hope to respond more directly to readers’ questions about front-end technology and help everyone gradually establish a solid foundation. Whether it's HTML, CSS, JavaScript, or various common frameworks and tools, we'll explain concepts in a simple and easy-to-understand way, and provide practical examples and exercises to solidify what you've learned. At the same time, we will also share some practical tips and best practices to help you better understand and apply various technologies in front-end development.
Not only that, we will also regularly launch some practical project tutorials so that you can apply the knowledge you have learned to actual development. Through the practice of actual projects, you will be able to better understand the workflow and methodology of front-end development, and develop your own ability to solve problems and develop independently. We believe that only by continuous accumulation and practice can we truly master front-end development technology. So, get ready for the challenge and bravely embark on this front-end entry journey! Whether you are looking for a career change, upskilling or fulfilling personal interests, we are dedicated to providing you with the best learning resources and support. Let's explore the wonderful world of web development together! Join the front-end entry journey and become an outstanding front-end developer! Let’s start the front-end journey
⭐ Shallow Equality
In JavaScript, determining whether two objects are equal is a common task. To know if two objects are equal, you can use different methods, depending on your needs.
Shallow equality compares whether two objects refer to the same memory address. You can use the strict equality operator (===) to perform shallow equality comparisons.
const obj1 = {
name: "Alice" };
const obj2 = {
name: "Alice" };
console.log(obj1 === obj2); // false，因为它们引用不同的内存地址
In the example above, the property values of obj1and obj2are the same, but they are not the same object.
⭐ Deep Equality
Deep equality compares whether the contents of two objects are the same, even if they reference different memory addresses. Typically, you need to recursively compare the properties of objects to ensure that their values are also equal.
⭐ Custom deep equality function
You can write a custom deep equality function to implement deep equality comparisons. Here's a simple example:
function deepEqual(obj1, obj2) {
// 使用 JSON 序列化对象并比较序列化后的字符串
const str1 = JSON.stringify(obj1);
const str2 = JSON.stringify(obj2);
return str1 === str2;
}
const obj1 = {
name: "Alice", age: 30 };
const obj2 = {
name: "Alice", age: 30 };
console.log(deepEqual(obj1, obj2)); // true，因为它们的属性值相同
Note that a limitation of this approach is that it cannot handle objects containing special values such as functions, undefined, etc.NaN
⭐ Use third-party libraries
For more accurate and reliable deep equality comparisons, you can use third-party libraries, such as the function in Lodash isEqualor other deep equality libraries. These libraries are often able to handle a wider range of situations, including handling nested objects and special values.
const _ = require("lodash");
const obj1 = {
name: "Alice", age: 30 };
const obj2 = {
name: "Alice", age: 30 };
console.log(_.isEqual(obj1, obj2)); // true，使用 Lodash 的深相等函数
In summary, to determine whether two objects are equal, you can choose shallow equality or deep equality methods, depending on your needs and the complexity of the objects. Custom deep equality functions are a general approach, but for more complex cases it may be more reliable to use a specialized deep equality library.
⭐Write at the end
This column is suitable for a wide range of readers, and is suitable for front-end beginners; or those who have not learned front-end and are interested in front-end, or back-end students who want to better show themselves and expand some front-end knowledge points during the interview process, so If you have the basics of front-end and follow this column, it can also help you to a great extent to check for omissions and fill in the gaps. Since the blogger himself does the content output, if there are any flaws in the article, you can contact me through the left side of the homepage. , let’s make progress together, and at the same time, I also recommend several columns to everyone. Interested partners can subscribe: In addition to the columns below, you can also go to my homepage to see other columns;
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