javascript - Preserve `this` with recursive setImmediate() -

salam (means hello:))

in node.js app, need use setimmediate() recessively call function , keep context intact next execution.

consider following example:

var i=3;  function myfunc(){     console.log(i, this);     --i && setimmediate(arguments.callee); }  myfunc(); 

output:

3 // regular `this` object 2 { _idlenext: null, _idleprev: null, _onimmediate: [function: myfunc] } 1 { _idlenext: null, _idleprev: null, _onimmediate: [function: myfunc] } 

as can see, after first execution this overwritten. how should work around this?

do this:

function myfunc(){     console.log(i, this);     --i && setimmediate(myfunc.bind(this)); } 

as may notice, removed arguments.callee: its use deprecated , forbidden in strict mode.