Flattening multidimensional arrays in javascript -


i need flatten multidimensional arrays code flattens 1 array , stops. wrong? how transfer elements no arrays. 

 function flatten(arr) {      // i'm steamroller, baby      arr.reduce(function (flat, toflatten) {         return flat.concat(array.isarray(toflatten) ? flatten(toflatten) : toflatten);      },[]);     }     flatten([[['a']], [['b']]]);   assert.deepequal(flatten([[['a']], [['b']]]), ['a', 'b'], 'should flatten nested arrays');  should flatten nested arrays: expected [ [ 'a' ], [ 'b' ] ] equal [ 'a', 'b' ]

you're doing right -- missing return statement.

function flatten(arr) {     // i'm steamroller, baby     return arr.reduce(function (flat, toflatten) {         return flat.concat(array.isarray(toflatten) ? flatten(toflatten) : toflatten);     }, []); }  console.log(flatten([[['a']], [['b']]]));

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