javascript - Function apply with Promises -

i'm working on promise-based project in node.js using bluebird, , in native promises es6. in both, have chain query database in following form:

some_function(/*...*/)      .then(function () {         return query("select `whatever` `wherever` ")     })      .then(/*...*/) 

note query returns promise resolved query result. repeats in several chains, , i'm looking way clean unused function wrapper.

i'd naturally use function.prototype.apply(), in case, when try:

.then(query.apply(this, ["select * ... "])) .then(function(rows){ /*...*/ }) 

the next function in chain gets rows undefined.

thanks ahead. appreciated.

you have pass function reference .then() choices follows:

1. use inline anonymous function are.
2. create own utility function returns function (see example below)
3. use .bind() create function.

the inline anonymous

some_function(/*...*/).then(function () {     return query.apply("select `whatever` `wherever` ") }).then(/*...*/) 

your own function wrapper

function querywrap(q) {     return function() {         return query.apply(q);     } }  some_function(/*...*/)   .then(querywrap("select `whatever` `wherever` "))   .then(/*...*/) 

this wrapper useful if use in multiple places. not worth 1 invocation.

use .bind()

some_function(/*...*/)   .then(query.apply.bind(query, "select `whatever` `wherever` "))   .then(/*...*/)