What is the most elegant way to insert objects between array elements?

Question

I'm sure there are many ways to achieve that but I'm looking for something "elegant".

a = [   'a',   'b',   'c' ];  magicArrayJoin(a, {value: 255} ); // insert the same object between each item  result ==  [   'a',   {value: 255},   'b',   {value: 255}   'c' ]; 

All proposals are welcome. :)

Answer 1

You can do it with flatMap. It can be found from lodash for example

_.flatMap([1,2,3,4], (value, index, array) =>      array.length -1 !== index // check for the last item      ? [value, "s"]      : value ); 

ouputs

[1, "s", 2, "s", 3, "s", 4] 

Update

Array#flatMap proposal is in the works so in future this should work:

[1, 2, 3, 4].flatMap(     (value, index, array) =>         array.length - 1 !== index // check for the last item             ? [value, "s"]             : value, );