javascript - How to pass 'this' into a Promise without caching outside? -


i have variable called langdataservice.isdataready promise wawiting resolved. upon resolve logic happen. how can pass promise?

langdataservice.isdataready.then(function () {     this.modalon() });

i know can cache var self_ = this; i'm curious of other alternatives? 

langdataservice.isdataready.then(function () {   this.modalon() }.bind(this));

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