Editing Eval (section)

==== JavaScript ====
In [[JavaScript]], <code>eval</code> is something of a hybrid between an expression evaluator and a statement executor. It returns the result of the last expression evaluated.

Example as an expression evaluator:
<syntaxhighlight lang="javascript">
foo = 2;
alert(eval('foo + 2'));
</syntaxhighlight>

Example as a statement executor:
<syntaxhighlight lang="javascript">
foo = 2;
eval('foo = foo + 2;alert(foo);');
</syntaxhighlight>

One use of JavaScript's <code>eval</code> is to parse [[JSON]] text, perhaps as part of an [[Ajax (programming)|Ajax]] framework.  However, modern browsers provide <code>JSON.parse</code> as a more secure alternative for this task.