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Archive for December, 2018

You can’t tell what a JavaScript program does by looking at it

Posted in Uncategorized on December 22, 2018| Leave a Comment »

Consider the following example – this is valid JavaScript! But just by looking at it, that seems unlikely… Try copying the code portion into a browser console and see for yourself.

$ cat redef-keywords.js
if‌ = isNaN;

if‌ (NaN)
    console.log("This line will never be printed.");
$ node redef-keywords.js
This line will never be printed.
$

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