How to do equivalent of LINQ SelectMany() just in javascript

Question

Unfortunately, I don\'t have JQuery or Underscore, just pure javascript (IE9 compatible).

I\'m wanting the equivalent of SelectMany() from LINQ functionality.

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Answer 1

Sagi is correct in using the concat method to flatten an array. But to get something similar to this example, you would also need a map for the select part https://msdn.microsoft.com/library/bb534336(v=vs.100).aspx

/* arr is something like this from the example PetOwner[] petOwners = 
                    { new PetOwner { Name="Higa, Sidney", 
                          Pets = new List{ "Scruffy", "Sam" } },
                      new PetOwner { Name="Ashkenazi, Ronen", 
                          Pets = new List{ "Walker", "Sugar" } },
                      new PetOwner { Name="Price, Vernette", 
                          Pets = new List{ "Scratches", "Diesel" } } }; */

function property(key){return function(x){return x[key];}}
function flatten(a,b){return a.concat(b);}

arr.map(property("pets")).reduce(flatten,[])