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It is worth mentioning command line uses — you can install these tools as command line utilities (available via the CLI — command line interface) using npm (Node Package Manager — you'll have to install Node JS first).
For example, the following command installs JSHint: You can then point these tools at Java Script files you want to lint, for example: You can also use these tools with a task runner/build tool such as Gulp or Webpack to automatically lint your Java Script during development.
Historically, Java Script was plagued with cross-browser compatibility problems — back in the 1990s, the main browser choices back then (Internet Explorer and Netscape) had scripting implemented in different language flavours (Netscape had Java Script, IE had JScript and also offered VBScript as an option), and while at least Java Script and JScript were compatible to some degree (both based on the ECMAScript specification), things were often implemented in conflicting, incompatible ways, causing developers many nightmares.
Such incompatibility problems persisted well into the early 2000s, as old browsers were still being used and still needed supporting.
At this point, the right-hand side will update to show some very useful information.
This includes information on using browser dev tools to track down and fix problems, using Polyfills and libraries to work around problems, getting modern Java Script features working in older browsers, and more.For example, see the "Plugins for text editors and IDEs" section of the JSHint install page.There are other ways to use such linters; you can read about them on the JSHint and ESLint install pages.Let's investigate this now, using a more sophisticated feature of browser developer tools: the Java Script debugger as it is called in Firefox.The main feature of such tools is the ability to add breakpoints to code — these are points where the execution of the code stops, and at that point you can examine the environment in its current state and see what is going on. First of all, we know that the error is being thrown at line 51.