0.0.1 • Published 9 years ago
highland-wrapcallback v0.0.1
highland-wrapCallback
A method-specific replacement for highland.js' wrapCallback function
This module addresses a common issue with Highland.js, in particular with highland's wrapCallback function, when used on a method of an object, which needs to access its parent object.
The Symptom
When trying to use it in its simplest form:
H.wrapCallback ( someObject.someFunction )( theInputParameters )
.errors ( function ( error ) {
console.error ( error );
} )
.each ( console.log );
one encounters errors along the lines of:
return this.makeRequest(method, params, callback);
^
TypeError: undefined is not a function
This happens when the function needs to access its parent, which gets lost in the process of passing it as a parameter into wrapCallback.
The Usual Workaround
Usually, you then have to resort to the following, slightly verbose way of dealing with it:
H.wrapCallback ( function ( parms, callBack ) {
someObject.someFunction ( parms, callBack );
} )( theInputParameters )
.errors ( function ( error ) {
console.error ( error );
} )
.each ( console.log );
The Solution
This is solved by highland-wrapCallback, by adding an additional parameter, which is the parent of the function, and supplying the function name as a string:
var wrapCallback = require ( 'highland-wrapcallback' );
wrapCallback ( someObject, 'someFunction' )( theInputParameters )
.errors ( function ( error ) {
console.error ( error );
} )
.each ( console.log );
That's it!
0.0.1
9 years ago