group-by

v0.9.6

STATUS

Passing

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Public

PUBLISHED

5 years ago

SIZE

2 KB

Splits a list into sub-lists stored in an object, based on the result of

Object

String

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groupBy (

fn:Function,

list:Array

) : Object

Splits a list into sub-lists stored in an object, based on the result of calling a String-returning function on each element, and grouping the results according to values returned.

Dispatches to the groupBy method of the second argument, if present.

Acts as a transducer if a transformer is given in list position.

Example

const byGrade = R.groupBy(function(student) {
       const score = student.score;
       return score < 65 ? 'F' :
              score < 70 ? 'D' :
              score < 80 ? 'C' :
              score < 90 ? 'B' : 'A';
     });
     const students = [{name: 'Abby', score: 84},
                     {name: 'Eddy', score: 58},
                     // ...
                     {name: 'Jack', score: 69}];
     byGrade(students);
     // {
     //   'A': [{name: 'Dianne', score: 99}],
     //   'B': [{name: 'Abby', score: 84}]
     //   // ...,
     //   'F': [{name: 'Eddy', score: 58}]
     // }

Arguments

fn: Function

Function :: a -> String

list: Array

The array to group

Returns

Object

An object with the output of `fn` for keys, mapped to arrays of elements that produced that key when passed to `fn`.