pxt-calliope/docs/js/call.html

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2017-08-19 17:16:35 +02:00
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:og="http://ogp.me/ns#" xmlns:fb="http://www.facebook.com/2008/fbml">
<head>
<meta charset="UTF-8">
<title>calliope mini - Blocks / Javascript editor - calliope</title>
<meta name="Description" content="A Blocks / JavaScript code editor for the calliope mini." />
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<meta name="twitter:card" content="summary" />
<meta name="twitter:site" content="@mspxtio" />
<meta name="twitter:title" content="calliope mini - Blocks / Javascript editor - calliope" />
<meta name="twitter:description" content="A Blocks / JavaScript code editor for the calliope mini." />
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<meta property="og:title" content="calliope mini - Blocks / Javascript editor - calliope" />
<meta property="og:site_name" content="PXT" />
<meta property="og:type" content="website" />
<meta property="og:description" content="A Blocks / JavaScript code editor for the calliope mini." />
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<h1 id="call-a-function">Call a function</h1>
<p>The simplest way to get started in JavaScript with your Calliope mini is to
call one of the Calliope minis built-in JavaScript functions. Just like Blocks
are organized into categories/drawers, the Calliope mini functions are organized by
namespaces, with names corresponding to the drawer names. The <code>basic</code> namespace
contains a number of helpful functions, such as:</p>
<pre><code class="lang-typescript">basic.showString(<span class="hljs-string">"Hello!"</span>)</code></pre>
<p>If you want to see all functions available in the <code>basic</code> namespace, simply type <code>basic</code>
followed by <code>.</code> and a list of all the functions will appear. </p>
<p><img class="ui image" src="/static/mb/js/basicFuns.png" alt=""></p>
<p>This feature is known as “Intellisense”. Continue typing to select one of the functions,
or click on one of the functions to select. You also narrow down the set of functions by typing, as below:</p>
<p><img class="ui image" src="/static/mb/js/basicIntell.png" alt=""></p>
<p>You can type anything to see what Intellisense will find for you. Heres an example
of what happens when you type the word <code>for</code>:
<img class="ui image" src="/static/mb/js/forIntell.png" alt=""></p>
<h2 id="function-parameter-values">Function parameter values</h2>
<p>You might have noticed that the call <code>showString</code> above takes one parameter value,
the string to be scrolled on the LED screen. There is a second (optional)
parameter that controls the speed of the scroll. Try this:</p>
<pre><code class="lang-typescript">basic.showString(<span class="hljs-string">"Hello!"</span>,<span class="hljs-number">50</span>)</code></pre>
<p>Intellisense shows all the available parameters for a function. </p>
<h2 id="left-and-right-parentheses-please-">Left and right parentheses, please!</h2>
<p>Whenever you want to call a function, you give the name of the function
followed by <code>(</code> and ending with <code>)</code>. Inbetween the left and right
parentheses go the function arguments. If a function has zero arguments, you still
need the parentheses in order to call the function. For example</p>
<pre><code class="lang-typescript">basic.clearScreen()</code></pre>
<p>Its a syntax error to have a left parenthesis without the “closing” right parenthesis:</p>
<pre><code>basic.clearScreen(</code></pre>
<a class="ui primary button" href="/pxt-calliope/docs/js/sequence.html">
<p>NEXT: Sequencing Commands</p>
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<p style="margin-top:1em"><a href="https://github.com/Microsoft/pxt-calliope/blob/master/docs/docs/js/call.md"><i class="write icon"></i>Edit this page on GitHub</a></p>
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