Function.call Method As Callback

Excuse me if I've something missed, but when I try to use call method as a callback it gives me strange error in both Chrome and Node.js. [' foo', ' bar '].map(String.prototype.t

Solution 1:

The easiest solution to your problem is to just write it out:

['  foo', ' bar  '].map(s => s.trim());

If you want to pass a function, you will need something more complicated than you want, along the lines of

.map(Function.call.bind(String.prototype.trim))

or if you prefer

.map(Function.call, String.prototype.trim)

This question may answer all your issues.