Visual Studio Code javascript validation

Question

I'm starting to get annoyed when I'm using if statements. Sometimes i'm a bit to fast and i only use one "=" in my IF statement and then run my code. At first glance there is nothing wrong, but as i use my application weird stuff is happening. Then I use some time to go through my code to figure out that i only used one "=" in my IF statement.

So i'd like to know why an IF statement with one "=" get valid?

I remember some time ago when visual studio code would let me know through validation that it wasn't a valid statement. Or is it a vs code change that allow users to use one "=" in their if statements? Or is it just valid code?

if (k = array[i])
{
    console.log(k);
}

Sunoj Vijayan · Accepted Answer · 2019-01-28 09:08:56Z

3

Try installing "VS Code JSHint extension" in your Visual Studio Code. If you are also interested you can use "vscode-tslint" for type script. It helps a lot.

answered Jan 28, 2019 at 9:08

Sunoj Vijayan

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2 Comments

NotJohn Over a year ago

JSHint works perfectly for my needs, now i won't screw up as much ;) Thanks!

Sunoj Vijayan Over a year ago

You are most welcome. Can you please upvote if useful.

OliverRadini · Accepted Answer · 2019-01-28 09:02:38Z

1

It is a valid statement. However, it's very rarely what you actually want to do. A single equals is an assignment, which returns the value which was assigned:

console.log(a = 'hello');

Almost always you want to use a triple equals === as it's typically the safest way to make comparisons.

As to when vscode stopped flagging this up as a problem, that depends on how you've got your vscode setup. It isn't strictly a problem but I'm sure there are some linters which would alert you to this as a problem. You'd need to provide some more in depth information as to what your vscode setup is, which is probably a separate question altogether.

answered Jan 28, 2019 at 9:02

OliverRadini

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4 Comments

NotJohn Over a year ago

Thanks for your answer i'll try to find some extension that will let me know when i forgot to put in the proper amount of "="

OliverRadini Over a year ago

eslint has a rule called no-cond-assign, with the right config this would flag it up to you eslint.org/docs/rules/no-cond-assign

NotJohn Over a year ago

Just because i'm curios when would you use an assignment in an if statement, and it would make sense?

OliverRadini Over a year ago

There are a few edge cases, I can't say I've ever run into them personally, but this answer goes through a few of them: stackoverflow.com/questions/151850/…

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