flatMap [Array#reduce]

flatMap [Array#reduce].markdown

flatMap [Array#reduce]

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<pre style="padding: 20px"><code class="hljs js">
let stuff = ['a', 'b', 'c', ['e', 'f', 'g']];

function flatMap(list, projection){
  return list.reduce( (acc, curr) =>
    Array.isArray(curr)
      ? acc.concat(curr.map(projection))
      : acc.concat(projection(curr))
  , []);
}

console.log(flatMap(stuff, (x)=>x+'1'));

// ["a1", "b1", "c1", "e1", "f1", "g1"]

</code></pre>

script.typescript

let stuff = ['a', 'b', 'c', ['e', 'f', 'g']];

function flatMap(list, projection){
  return list.reduce( (acc, curr) =>
    Array.isArray(curr)
      ? acc.concat(curr.map(projection))
      : acc.concat(projection(curr))
  , []);
}

console.log(flatMap(stuff, (x)=>x+'1'));

// ["a1", "b1", "c1", "e1", "f1", "g1"]


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