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Beware the Perils of JavaScript

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Beware the Perils of JavaScript

· Web Dev Zone ·
Free Resource

Deploying code to production can be filled with uncertainty. Reduce the risks, and deploy earlier and more often. Download this free guide to learn more. Brought to you in partnership with Rollbar.

These two links are definitely worth a read I think...

http://oreilly.com/javascript/excerpts/javascript-good-parts/bad-parts.html

and especially…

http://oreilly.com/javascript/excerpts/javascript-good-parts/awful-parts.html

e.g.

Semicolon Insertion

JavaScript has a mechanism that tries to correct faulty programs by automatically inserting semicolons. Do not depend on this. It can mask more serious errors.

It sometimes inserts semicolons in places where they are not welcome. Consider the consequences of semicolon insertion on thereturn statement. If a return statement returns a value, that value expression must begin on the same line as the return:

return
{
status: true
}; 

This appears to return an object containing a status member. Unfortunately, semicolon insertion turns it into a statement that returns undefined. There is no warning that semicolon insertion caused the misinterpretation of the program. The problem can be avoided if the { is placed at the end of the previous line and not at the beginning of the next line:

return {
status: true
};




Deploying code to production can be filled with uncertainty. Reduce the risks, and deploy earlier and more often. Download this free guide to learn more. Brought to you in partnership with Rollbar.

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