removing dangling doc page
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# @extends
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### #letexample
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A variable is created for the number returned by the [brightness](/reference/led/brightness) function.
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```block
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let b = led.brightness();
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```
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### #readvariableexample
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For example, the following code shows the value stored in `counter` on the LED screen:
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```blocks
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let counter = 1;
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basic.showNumber(counter);
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```
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### #updatevariableexample
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The following code sets `counter` to 1 and then increments `counter` by 10:
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```block
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let counter = 1;
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counter = counter + 10;
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basic.showNumber(counter);
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```
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### #whyusevariablesexample
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A counter is a great example:
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```block
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let counter = 0;
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input.onButtonPressed(Button.A, () => {
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counter = counter + 1;
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basic.showNumber(counter);
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});
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```
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### #localvariableexample
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```block
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// x does NOT exist here.
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if (led.brightness() > 128) {
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// x exists here
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let x = 0;
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}
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```
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