plusone
v0.0.3
Published
A function to increment a value that treats undefined as 0, useful for hash tables of counts.
Downloads
1
Readme
plusone
plusone is a simple function that will return the increment of a value. What makes it special? It will increment undefined to be 1 (null already increments to 1 just fine).
Why would you need that? Because of this:
var obj = {
bar: 'foo'
};
// this results in undefined + 1 === NaN
obj.foo = obj.foo + 1;
// this doesn't work right if obj.bar is a truthy string
obj.bar = obj.bar ? obj.bar + 1 : 1;
// this works as expected, but is long and not that readable
obj.baz = typeof obj.baz !== 'undefined' ? obj.baz + 1 : 1;
// this works as we expect, and reads pretty nicely, see? :)
obj.count = plusone( obj.count );
Installation
npm install plusone --save
Usage
var plusone = require( 'plusone' );
var i = 0;
i = plusone( i );
var obj = {};
obj.count = plusone( obj.count );
Contributing
Pull requests are very welcome! Just make sure your code:
Passes jshint given the included .jshintrc
Is beautified using jsbeautifier and the included .jsbeautifyrc
Has tests and passes them.
CHANGELOG
0.0.3
- REAME example fixed
0.0.2
- Documentation updates
- A couple of more tests
0.0.1
- Initial release.