Feature Request : If* Functionality

[ssttuu]

It would be very useful to have a way to declaratively fall back to another value. Perhaps a set of 'if*' transformations would an easy way to do this.

For instance: 'ifNull', 'ifTruthy', 'ifFalsey'

'price': [ 'document',
             'querySelector:.main-product .sale-price',
             'innerText',
             'match:/[\d\.]+/',
             'getIndex:0',
             'toFloat',
             'ifNull',
             'document',
             'querySelector:.main-product .list-price',
             'innerText',
             'match:/[\d\.]+/',
             'getIndex:0',
             'toFloat'
],

The 'ifNull' point would determine whether or not it continues to the next transformations or returns the current value.

Thoughts?

[vail130]

The feature sounds good. I think I'd be more partial to specifying an object with an array of arrays. Maybe something like this:

Composable({
    price: {
        test: 'isFloat',
        transformations: [
            [
                'document',
                'querySelector:.main-product .sale-price',
                'innerText',
                'match:/[\d\.]+/',
                'getIndex:0',
                'toFloat'
            ],
            [
                'document',
                'querySelector:.main-product .list-price',
                'innerText',
                'match:/[\d\.]+/',
                'getIndex:0',
                'toFloat'
            ]
        ]
    }
});

[jonathan-ostrander]

+1 because Neiman Marcus is AB testing