I've re-implemented my own version of what I need but I suspect this is already included in underscore since it's so simple and so closely related to many other functions. But I can't think of what it should be called.
Basically, what I want is a version of _.pluck that works with objects and returns an object instead of an array (with its associated keys).
So, for instance, if I had an object like this:
elements: {
steam: {
temperature: 100,
color: 'orange',
state: 'gas'
},
water: {
temperature: 50,
color: 'blue',
state: 'liquid'
},
ice: {
temperature: 0,
color: 'white',
state: 'solid'
}
}
I'd want to call _.something(elements, 'temperature')
And have it return
{
steam: 100,
water: 50,
ice: 0
}
Instead of _.pluck(elements, 'temperature') which returns
[100, 50, 0]
What is this transformation called and is it already included in underscore? I've written a quick version myself with jQuery's each loop since I'm more familiar with jQuery than underscore (included below) but would prefer to use one from the library if possible.
$.objPluck = function(obj, key) {
var ret = {};
$.each(obj, function(k, value) {
ret[k] = value[key];
});
return ret;
}
