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QL code and tests for C#/C++/JavaScript.

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Pavel Avgustinov
2018-08-02 17:53:23 +01:00
commit b55526aa58
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javascript/ql/src/LanguageFeatures/YieldInNonGenerator.qhelp Normal file
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<!DOCTYPE qhelp PUBLIC
"-//Semmle//qhelp//EN"
"qhelp.dtd">
<qhelp>
<overview>
<p>
Previous versions of SpiderMonkey permitted the use of <code>yield</code> expressions in
functions not marked as generators. This is no longer supported, and is not compliant
with ECMAScript 2015.
</p>
</overview>
<recommendation>
<p>
Mark the enclosing function as a generator by replacing <code>function</code> with
<code>function*</code>.
</p>
</recommendation>
<example>
<p>
The following example uses <code>yield</code> to produce a sequence of indices, but the
function <code>idMaker</code> is not marked as a generator:
</p>
<sample src="examples/YieldInNonGenerator.js" />
<p>
This is easily fixed by adding an asterisk to the <code>function</code> keyword:
</p>
<sample src="examples/YieldInNonGeneratorGood.js" />
</example>
<references>
<li>Mozilla Developer Network: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function*">function*</a>.</li>
<li>Mozilla Developer Network: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/yield">yield</a>.</li>
</references>
</qhelp>