Answer1215

摘要： If you’re only instrumenting the files in your project that are under test then your code coverage report will be misleading and it will be difficult 阅读全文

摘要： How much of your code runs during unit testing is an extremely valuable metric to track. Utilizing code the karma-coverage plugin and babel-plugin-__c 阅读全文

摘要： When writing tests run by Karma for an application that’s bundled with webpack, it’s easiest to integrate webpack and Karma directly together. In this 阅读全文

摘要： When you have a dependency that has dependencies on global variables (like jQuery or lodash) or assumes that this is bound to window, you can use the  阅读全文

摘要： Let's try creating a deeper tree structure. This time we have 4 separate arrays each containing lists, videos, boxarts, and bookmarks respectively. Ea 阅读全文

摘要： 1. Use a for loop to traverse the videos and bookmarks array at the same time. For each video and bookmark pair, create a {videoId, bookmarkId} pair a 阅读全文

摘要： Three ways to make object immutable: 1. Use JSON.parse(JSON.stringify(obj)): this approach is little bit expense. 2. Use Object.create() This is a che 阅读全文

摘要： concatAll: Exercise 12: Retrieve id, title, and a 150x200 box art url for every video You've managed to flatten a tree that's two levels deep, let's t 阅读全文

摘要： fetch() does the same thing as XHR, but fetch return a promise. Check the reponse API here: Link Besides text(), you can use json() or blob(). 'no-cor 阅读全文

摘要： You can fine tune several webpack plugins to make your bundle as small as it can be for your specific application. However there are a few things you 阅读全文