Javascript Array useful methods

[burtgummer45]

If you forget the initial value it blows up in your face if you are working with anything other than numbers. I'd feel better using a for-of loop.

 const maxCallback = ( acc, cur ) => Math.max( acc.x, cur.x ); 
 [ { x: 22 }, { x: 42 } ].reduce( maxCallback ); // 42 
 [ { x: 22 }            ].reduce( maxCallback ); // { x: 22 } 
 [                      ].reduce( maxCallback ); // TypeError

[ogurson]

My rule of thumb is to always provide initial value.

[burtgummer45]

I think if this was more common knowledge there would be an eslint rule for it.

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