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Revise 'Coin Flipper' step descriptions (#939)

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* Revise 'coin flipper' text some

* Expand step 6
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Galen Nickel 2018-07-08 21:08:03 -07:00 committed by GitHub
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docs/projects/coin-flipper.md
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@ -1,8 +1,10 @@
# Coin Flipper # Coin Flipper
Let's create a coin flipping program to simulate a real coin toss. We'll use icon images to represent a ``heads`` or ``tails`` result.
## Step 1 ## Step 1
Place a ``||input:on button pressed||`` block to run code when button **A** is pressed. Get an ``||input:on button A pressed||`` block from the ``||input:Input||`` drawer in the toolbox. The coin flip code we add will run when button **A** is pressed.
```blocks ```blocks
input.onButtonPressed(Button.A, () => { input.onButtonPressed(Button.A, () => {
@ -11,21 +13,21 @@ input.onButtonPressed(Button.A, () => {
## Step 2 ## Step 2
Place a **if** block and check the value returned by the ``||Math:pick random true or false||`` block. Grab an ``||logic:if else||`` block and set it inside ``||input:on button A pressed||``. Put a ``||Math:pick random true or false||`` into the ``||logic:if||`` as its condition.
``||Math:pick random true or false||`` returns ``true`` or ``false`` randomly. The ``||Math:pick random true or false||`` returns a random ``true`` or ``false`` value which we use to determine a ``heads`` or ``tails`` result for a coin toss.
```blocks ```blocks
input.onButtonPressed(Button.A, () => { input.onButtonPressed(Button.A, () => {
if (Math.randomBoolean()) { if (Math.randomBoolean()) {
} else { } else {
} }
}); })
``` ```
## Step 3 ## Step 3
Place a ``||basic:show icon||`` block under the **if** and pick one of the images. Now, put a ``||basic:show icon||`` block inside both the ``||logic:if||`` and the ``||logic:else||``. Pick images to mean ``heads`` and ``tails``.
```blocks ```blocks
input.onButtonPressed(Button.A, () => { input.onButtonPressed(Button.A, () => {
@ -34,16 +36,16 @@ input.onButtonPressed(Button.A, () => {
} else { } else {
basic.showIcon(IconNames.Square) basic.showIcon(IconNames.Square)
} }
}); })
``` ```
## Step 4 ## Step 4
Click ``|Download|`` to transfer your code in your @boardname@ and press button **A** to try it out. Click ``|Download|`` to transfer your code into your @boardname@. Press button **A** to "toss a coin" and see the result.
## Step 5 ## Step 5
Place multiple ``||basic:show icon||`` blocks before the **if** to create a coin flipping animation. You can animate the coin toss to add the feeling of suspense. Place different ``||basic:show icon||`` blocks before the ``||logic:if||`` to show that the coin is flipping before the result appears.
```blocks ```blocks
input.onButtonPressed(Button.A, () => { input.onButtonPressed(Button.A, () => {
@ -61,4 +63,4 @@ input.onButtonPressed(Button.A, () => {
## Step 6 ## Step 6
Click ``|Download|`` to transfer your code in your @boardname@ and press button **A** to try it out! Click ``|Download|`` to transfer your code to your @boardname@ again and press button **A** for a flip. Test your luck and guess ``heads`` or ``tails`` before the toss is over!