Flatten Javascript / Typescript object array : I have an array of object like below 

    let list = [
      {
        'items': [
          'item 1',
          'item 2'
        ]
      },
      {
        'items': [
          'item 3'
        ]
      }
    ]

and I want flatten array from this array like below

    ['item 1','item 2','item 3']

which javascript / typescript function (chaining) I should use so I will get expected output.

I have tried with map function `list.map(i => i.items)` but I got array in array like below 

    [["item 1","item 2"],["item 3"]]

**NOTE** : I am looking for any existing function / function chaining if available to get expected output. I am not expecting result by any loop.
 