process.stdout.write not working inside setTimeout

Question

process.stdout.write not working inside setTimeout

Running in node.js, whenever I do something like

setTimeout(process.stdout.write, 200, "Test")

I get the following error:

Cannot read property 'defaultEncoding' of undefined

I have tried to set

setTimeout(process.stdout.write.bind(this), 200, "Test")

Still not working

javascript
node.js

Answer 1

When you call process.stdout.write(...), the context (this) inside of it is process.stdout. When you pass it to setTimeout, this context gets lost. As you noticed, bind is the correct way to fix this - but you need to bind to the right thing:

setTimeout(process.stdout.write.bind(process.stdout), 200, "Test")