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2.2
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2.1
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2.0
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1.4
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0.9.1
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0.8.8
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<h1 id="eol-syntax-updates">EOL Syntax Updates<a class="headerlink" href="#eol-syntax-updates" title="Permanent link">&para;</a></h1>
<p>The following is a brief description of changes to the Epsilon Object
Language's syntax in each release.</p>
<h3 id="22">2.2<a class="headerlink" href="#22" title="Permanent link">&para;</a></h3>
<ul>
<li>
<p><code>Tuple</code> type. Similar to a Map with String keys, but its properties can be
accessed like a regular object (using the <code>.</code> operator).</p>
</li>
<li>
<p>Assign if null operator <code>?=</code> as convenient shorthand for <code>a = a ?: b</code>, that is:
<code>a = a &lt;&gt; null ? a : b</code>.</p>
</li>
</ul>
<h3 id="21">2.1<a class="headerlink" href="#21" title="Permanent link">&para;</a></h3>
<ul>
<li>
<p><a href="https://en.wikipedia.org/wiki/Elvis_operator">Elvis operator</a> as a convenient
shorthand to use an alternative value if an expression is null.
<code>a ?: b</code> is a concise way of writing <code>a &lt;&gt; null ? a else b</code>.</p>
</li>
<li>
<p><a href="https://en.wikipedia.org/wiki/Safe_navigation_operator">Null-safe navigation operator</a>
to allow for easy chaining of feature calls without resorting to null checks.
For example, <code>null?.getClass()?.getName()</code> will return <code>null</code> without crashing.</p>
</li>
<li>
<p><code>!=</code> can be used as an alias for <code>&lt;&gt;</code> (i.e. "not equals").</p>
</li>
</ul>
<h3 id="20">2.0<a class="headerlink" href="#20" title="Permanent link">&para;</a></h3>
<ul>
<li>Ternary expressions, which can be used almost anywhere, not just in
assignments or returns. Syntax and semantics are identical to Java,
but you can also use the <code>else</code> keyword in place of the <code>:</code> if you
prefer.</li>
<li>Native lambda expressions. You can use first-order operation syntax
or JavaScript-style <code>=&gt;</code> for <a href="http://eclipse.org/epsilon/doc/articles/eol-syntax-updates/../lambda-expressions">invoking functional
interfaces.</a></li>
<li>Removed old-style OCL comments (<code>-*</code> and <code>--</code>).</li>
<li><code>--</code> can be used to decrement integers.</li>
<li>Thread-safe collection types: <code>ConcurrentBag</code>, <code>ConcurrentMap</code> and
<code>ConcurrentSet</code>.</li>
</ul>
<h3 id="14">1.4<a class="headerlink" href="#14" title="Permanent link">&para;</a></h3>
<ul>
<li>Added support for postfix increment operator (i.e. <code>i++</code>) and for
composite assignment statements (i.e.
<code>a +=1; a -= 2; a *= 3; a /= 4;</code>)</li>
</ul>
<h3 id="091">0.9.1<a class="headerlink" href="#091" title="Permanent link">&para;</a></h3>
<ul>
<li>Added support for externally defined variables.</li>
<li>Support for Map literal expressions (e.g.
<code>Map {key1 = value1, k2 = v2}</code>)</li>
</ul>
<h3 id="088">0.8.8<a class="headerlink" href="#088" title="Permanent link">&para;</a></h3>
<p>In 0.8.8 we extended the syntax of EOL so that it looks and feels a bit
more like Java. As the majority of Eclipse/EMF audience are Java
programmers, this will hopefully make their (and our) lives a bit
easier. Of course, all these changes also affect all languages built on
top of EOL.</p>
<p>More specifically, we have introduced:</p>
<ul>
<li>double quotes (<code>" "</code>) for string literals,</li>
<li>backticks (` `) for reserved words,</li>
<li>Java-like comments (<code>//</code> and <code>/**/</code>),</li>
<li><code>==</code> as a comparison operator,</li>
<li><code>=</code> as an assignment operator (in 0.8.7)</li>
</ul>
<p>All these changes (except for the double quotes which have now been
replaced by ` `) are non-breaking: the old syntax (<code>''</code> for strings,
<code>=</code> for comparison and <code>:=</code> for assignment still work). Below is an
example demonstrating the new syntax:</p>
<pre class="prettyprint lang-eol"><code>/*
This is a multi line comment
*/
// This is a single line comment
var i = 1;
if (i == 1) {
"Hello World".println();
}
i = 2; // Assigns the value 2 to i
var `variable with spaces` = 3;
`variable with spaces`.println(); // Prints 3</code></pre>
<p>If you have suggestions for further Java-ifications of the EOL syntax,
please post your comments to the <a href="http://eclipse.org/epsilon/doc/articles/eol-syntax-updates/../../../forum">Epsilon
forum</a>
or add them to <a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=292403">bug
292403</a>.</p>
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