Brainfuck Hello World! explained

brain_fuck_language.README

start with an array of unlimited size all intialized to 0and the curser point to 0.
with a input stream and output stream.

>: move cursor to next position
<: move cursor to last position
+: add 1 to current position
-: minus 1 to current position
[: if current position is 0, jump to paired ], otherwise execute next line 
]: if current position is non-0, scroll back to paired [, otherwise execute next line
.: output current position to the output stream (usually ASCII encoding)
,: read a byte from the input stream and save to current position

hello_world.bf

Hello World! in one line:
++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++.

Tracing:
             |data(zero-based), ACTION, (cursor position)
+++++  +++   |8(0)
[            |
    >++++    |8, 4 (1)
    [        |
        >++  |8, 4, 2          (2)
        >+++ |8, 4, 2, 3       (3)
        >+++ |8, 4, 2, 3, 3    (4)
        >+   |8, 4, 2, 3, 3, 1 (5)
        <<<<-|8, 3, 2, 3, 3, 1 (1)
    ]        |
             |8, 0, 8, 12, 12, 4 (1) (fast-forward)
    >+       |8, 0, 9, 12, 12, 4 (2)
    >+       |8, 0, 9, 13, 12, 4 (3)
    >-       |8, 0, 9, 13, 11, 4 (4)
    >>+      |8, 0, 9, 13, 11, 4, 1 (6)
    [        |
        <    |8, 0, 9, 13, 11, 4, 1 (1)
    ]        |
    <-       |7, 0, 9, 13, 11, 4, 1 (0)
]            |
             |0, 0, 72, 104, 88, 32, 8  (0) (fast-forward)
>>.          |0, 0, 72, 104, 88, 32, 8  PRINT(72) (2)
>---.        |0, 0, 72, 101, 88, 32, 8  PRINT(101) (3)
+++++ ++..   |0, 0, 72, 108, 88, 32, 8  PRINT(108), PRINT(108) (3)
+++.         |0, 0, 72, 111, 88, 32, 8  PRINT(111) (3)
>>.          |0, 0, 72, 111, 88, 32, 8  PRINT(32) (5)
<-.          |0, 0, 72, 111, 87, 32, 8  PRINT(87) (4)
<.           |0, 0, 72, 111, 87, 32, 8  PRINT(111) (3)
+++.         |0, 0, 72, 114, 87, 32, 8  PRINT(114) (3)
----- -.     |0, 0, 72, 108, 87, 32, 8  PRINT(108) (3)
----- ---.   |0, 0, 72, 100, 87, 32, 8  PRINT(100) (3)
>>+.         |0, 0, 72, 100, 87, 33, 8  PRINT(33) (5)
>++.         |0, 0, 72, 100, 87, 33, 10 PRINT(10) (6)
--------------
output: 72 101 108 108 111 32 87 111 114 108 100 33 10
        Hello World! in ASCII