Provide intelligent code completion for programming

Whenever I code in Khan Academy, I noticed how troublesome it is to always go to the bottom of the page to search through the documentation just for a specific function. Furthermore, not all functions are readily-available under the documentation and you will have to head over to ProcessingJS' reference (http://processingjs.org/reference/) to see the full documentation. It'd would have been better if there is a quicker way to see everything at once, in an intelligent manner.

With that, I'd like to request an intelligent code completion feature that helps to autocomplete code and to offer suggestions, such as possible keywords, values and functions to add to anything (function parameters, if statements, for loops etc.)

Such a feature would speed up writing code, make less mistakes and will help everyone discover new functions. The autocompletion service can appear as a small dialog box next to the cursor, similar to how the colour picker or the function information appears when the cursor is placed where appropriate.

Furthermore, this feature has already been implemented in IDEs outside of Khan Academy, such as Visual Studio (Microsoft's Intellisense: https://docs.microsoft.com/en-us/visualstudio/ide/using-intellisense?view=vs-2017) and NetBeans (https://netbeans.org/features/java/editor.html). In fact, even the console in web browsers (Edge, Firefox, Chrome, even Internet Explorer) have that autocompletion feature.

To conclude, an autocompletion service would help make coding much faster and easier, because everything is at your fingertips.