It's not displaying the properties of an array like length etc.
I'm not sure if this is a problem or this is expected behavior of VScode's autocomplete/IntelliSense.
Do I need to install any extensions to make it work?
Edit:
On adding var or let before arr the autocomplete works fine normally but inside a function it doesn't work.
Check if the building extension TypeScript and JavaScript Language Features is enabled.
To check this, go to Extensions and search for @builtin TypeScript and JavaScript Language Features.
This should look something like this: [![vscode][1]][1]
Edit:
Also, check if you choosed the right language?
CTRL (or CMD) + P> Change Language ModeJavaScriptAnother thing I noticed: You have no var, let or const before the variable, see stackoverflow.com/a/51962449/14401587
Edit 2:
IntelliSense does not know what types the parameters have for functions. But you can use the @param annotation in the comment:
/**
*
* @param {Array} arr
*/
function a(arr) {
arr.
}
For variables you can also use @type:
/** @type {Array} */
let a;
> Change Language Mode -> JavaScriptlet or var it works fine but inside a function it doesn't work. I'll edit my question a bit to explain thislet/var thing in your answer since this is also a problem someone else might face.Go to Extensions and search for @builtin TypeScript and JavaScript Language Features. Try stopping and restarting this plugin and restart VS Code. Looks like a bug. This fixed it for me.
For me I just stop the TypeScript and JavaScript Language Features extension, and it works fine, maybe a bug or a conflict with other extensions I think
