equivalent of _.pick() but for array in Lo-dash

Question

I have the following collection:

var columns = [     { key:'url', width:20, type:'text' },     { key:'title', width:21, type:'text' },     { key:'desc', width:22, type:'text' },     { key:'domain', width:23, type:'text' },     { key:'user', width:24, type:'text' } ]; 

I'm looking for a method to map an array of objects with picked keys, something along the lines of:

_.mapPick(columns, [width])  // [{width:20},{width:21},{width:22},{width:23},{width:24}] 

I know I can extend lo-dash like this:

_.mixin({     mapPick:  mapPick:function (objs,keys){         return _.map(objs, function (obj) {             return _.pick(obj,keys)         })     }  }); 

I'm not sure if there is some native function that I'm missing.

I found a similar question here but I'm looking for a more lo-dash native way.

Answer 1

I think the map() + pick() approach is your best bet. You could compose the callback instead of creating an inline function however:

_.map(columns, _.partialRight(_.pick, 'key'));