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  Go Engineer System Course 004 [Study Notes]

  Requirements Analysis Backend Management System Product Management Product List Product Categories Brand Management Brand Categories Order Management Order List User Information Management User List User Addresses User Messages Carousel Management E-commerce System Login Page Homepage Product Search Product Category Navigation Carousel Display Recommended Products Display Product Details Page Product Image Display Product Description Product Specification Selection Add to Cart Shopping Cart Product List Quantity Adjustment Delete Product Checkout Function User Center Order Center My...

  Walker

  Nov 25, 2025

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• In-depth Understanding of ES6 009 [Learning Notes]

  Classes in JavaScript function PersonType(name){ this.name = name; } PersonType.prototype.sayName = function(){ console.log(this.name) } var person = new PersonType("Nicholas") p…

  Walker

  Personal Mar 8, 2025

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• Go Engineer Structured Course 011 [Learning Notes]

  Inverted Index for Queries
  1. What is an Inverted Index?
  An Inverted Index is a data structure used to quickly find documents containing specific terms. It is one of the core technologies of search engines.
  1.1 Basic Concepts
  Forward Index: Document ID → Document Content (list of terms)
  Inverted Index: Term → List of Document IDs containing the term
  1.2 Why is it called "Inverted"?
  An inverted index reverses the traditional relationship of "which terms a document contains" to "in which documents a term appears...

  Walker

  Personal Nov 25, 2025

  311000

• In-depth Understanding of ES6 013 [Study Notes]

  Code Encapsulation with Modules

  JavaScript loads code using a "share everything" approach to loading code, which is one of the most error-prone and confusing aspects of the language. Other languages use concepts like packages to define code scope. Before ES6, everything defined in every JavaScript file within an application shared a single global scope. As web applications became more complex and the amount of JavaScript code grew, this practice led to issues such as naming conflicts and security concerns. One of ES6's goals was to address the scoping issue…

  Walker

  Personal Mar 8, 2025

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• In-depth Understanding of ES6 003 [Study Notes]

  Function parameter default values, as well as some details about the `arguments` object, how to use expressions as parameters, and the temporal dead zone for parameters. Previously, setting default values always relied on expressions containing the logical OR operator. When the preceding value was false, the latter value would always be returned. However, this became problematic if we passed 0 as an argument, requiring type verification. For example, `function makeRequest(url,timeout,callback){ timeout = t...`

  Walker

  Personal Mar 8, 2025

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