After stumbling upon CoffeeScript in a blog post, I was excited to try it out. My first attempt at using it involved this code snippet:
alert "Hello CoffeeScript!"
Unfortunately, it didn't work as expected and produced the following error message:
ReferenceError: alert is not defined
Am I missing something here?
JavaScript is closely related to the concept of environments, with options like browsers and Node.js available for running JS code (CoffeeScript compiles to JavaScript).
When using JavaScript in a browser, the global object is referred to as window. However, in Node.js, the global object is simply global.
Some methods are common in both environments, such as core JavaScript methods...
String.prototype methodsArray.prototype methodsObject.prototype methods...as well as specific window methods like setInterval or setTimeout.
However, functions like window.alert are not available in command-line interfaces (CLIs). To incorporate this feature in Node, you can utilize a package like alert-node by running npm i alert-node.
// alert.js
var alert = require('alert-node');
alert('Hello');
Command: node alert.js
# alert.coffee
alert = require 'alert-node'
alert 'Hello'
Command: coffee alert.coffee
window.alert is a function specified by the Document Object Model (DOM) within browsers, rather than being a part of Javascript itself. If the platform you are using does not support a global alert function, then attempting to invoke it will not work.
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