countBy_.countBy(list, iteratee, [context])
Sorts a list into groups and returns a count for the number of objects in each group. Similar to groupBy, but instead of returning a list of values, returns a count for the number of values in that group.
1 2 3 4 | _.countBy([1, 2, 3, 4, 5], function(num) { return num % 2 == 0 ? 'even': 'odd';});=> {odd: 3, even: 2} |
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