// source https://jsbin.com/gavovuh

index.html

<script id="jsbin-javascript">
//Challenge 9 Flatten array
//Take an array of arrays and flatten to a single array

function flattenArray(arrays)
{
  return arrays.reduce(function(a,b)
                       {
    return a.concat(b);
  })
}




const output = flattenArray([[1,2], [3,4], [5,6], [7]]);

console.log(output);
</script>


<script id="jsbin-source-javascript" type="text/javascript">//Challenge 9 Flatten array
//Take an array of arrays and flatten to a single array

function flattenArray(arrays)
{
  return arrays.reduce(function(a,b)
                       {
    return a.concat(b);
  })
}




const output = flattenArray([[1,2], [3,4], [5,6], [7]]);

console.log(output);</script>

jsbin.gavovuh.js

//Challenge 9 Flatten array
//Take an array of arrays and flatten to a single array

function flattenArray(arrays)
{
  return arrays.reduce(function(a,b)
                       {
    return a.concat(b);
  })
}




const output = flattenArray([[1,2], [3,4], [5,6], [7]]);

console.log(output);