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| define(['./_group', './_has'], function (_group, _has) {
|
| // Counts instances of an object that group by a certain criterion. Pass
| // either a string attribute to count by, or a function that returns the
| // criterion.
| var countBy = _group(function(result, value, key) {
| if (_has(result, key)) result[key]++; else result[key] = 1;
| });
|
| return countBy;
|
| });
|
|
