92b60a251d
* annotating APIs to support onstart * missed file * updated templates * adding new lines in main.ts * fixing docs * removing onstart * updated docs * updated various docs * more docs * adding upgrade policies for blocks * updated pxt reference * placing on start under "basic"
31 lines
678 B
Markdown
31 lines
678 B
Markdown
# If
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### @parent blocks/language
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Conditionally run code depending on whether a [Boolean](/blocks/logic/boolean) condition is true or false.
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```blocks
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if(true) {
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}
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```
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Click on the dark blue gear icon (see above) to add an *else* or *if* to the current block.
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### Example: adjusting screen brightness
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If the [light level](/reference/input/light-level) is `< 100`, this code sets the brightness to `255` when the button A is pressed:
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```blocks
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input.onButtonPressed(Button.A, () => {
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if(input.lightLevel()<100){
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led.setBrightness(255);
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}
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})
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```
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### See also
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[while loop](/blocks/loops/while), [for](/blocks/loops/for), [boolean](/blocks/logic/boolean)
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