A simple idiom for trying out blocks of code in sequence.
npm install try-thesetry-these(function)
========================================
This is a port of the PrototypeJS method Try.these.
It accepts an arbitrary number of functions and returns the result of the first
one that doesn't throw an error. try-these provides a simple idiom for trying
out blocks of code in sequence. Such a sequence of attempts usually represents
a downgrading approach to obtaining a given feature.
npm install try-these
var tryThese = require('try-these');
var XHR = tryThese(
function() { return new XMLHttpRequest() },
function() { return new ActiveXObject('Msxml2.XMLHTTP') },
function() { return new ActiveXObject('Microsoft.XMLHTTP') }
) || false;
In the above example, we want to get an XMLHttpRequest object.
try-these will try several ways in sequence, from the best (and,
theoretically, most widespread) one to the oldest and rarest way, returning
the result of the first successful function.
If none of the blocks succeeded, try-these will return undefined, which
will cause the XHR variable in the example above to return false, provided
as a fallback result value.
npm test
In lieu of a formal style guide, take care to maintain the existing coding
style. Add unit tests for any new or changed functionality. Lint and test your
code. See the CONTRIBUTING file for more detailed information.