while loop method to traverse array

I found this code when looking at the jQuery source code. I tried it myself and simply recorded it.

var arr = [ 'a', 'b', 'c', 'd' ],
    i = 0;while( arr[i++] ){    
    console.log( arr[i] );
    /*
    输出 b c d undefined
    */
}

The code execution sequence is:
(1) Determine whether while(arr[i]) exists, if it exists, execute (2) (3)
(2) i++
(3) console.log( arr[i] )

So, it can be written as console.log( arr[i-1] )

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