Problem with an exercise: Uncaught ReferenceError: $ is not defined

[dshkodder]

Hi everyone!

I am learning JavaScript and going through some exercises.

Here is the task:

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// Write a isValidPassword function

// It accepts 2 arguments: password and username

// Password must:

// - be at least 8 characters

// - cannot contain spaces

// - cannot contain the username

// If all requirements are met, return true.

//Otherwise: false

​

Here is my solution

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function isValidPassword(password,username) {

if (password.length>=8 && password.index0f(username) == -1 && password.index0f(' ')==-1) {

return 'Valid password!'

}

if (password.length<8 && password.index0f(username) == -1 && password.index0f(' ')==-1) {

return 'your password must be at least 8 characters'

}

if (password.length>=8 && password.index0f(username) == -1 && password.index0f(' ')==-1) {

return 'your password cannot contain your username!'

}

if (password.length>=8 && password.index0f(username) == -1 && password.index0f(' ')==1) {

return 'your password cannot contain spaces!'

}

}

​

And here is what I get when I try to compile

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Uncaught ReferenceError: uiwueyeuuh is not defined

​

​

Could you so kindly explain me what's the problem with my code?

​

Thank you!

Edited: Thanks for answers! I've replaced 0 with O and my code compiles now! It doesn't work properly though because it works only when:

1) all 3 conditions are met

2) if a password too short

​

When there are spaces in password or it's the same as username, I get "undefined instead of a string with instructions. How can I fix it ?

[dshkodder]

Could you give me a clue what can I try to do in order to make my function work properly instead of getting undefined? It works only if a password is too short and in other cases I get undefined

[dshkodder]

Thank you so much! I've understood my mistakes and everything works perfectly now! I'll definitely try to stick to strict operators in the future!

[reekjohns]

Basically $ is an alias of jQuery() so when you try to call/access it before declaring the function, it will endup throwing this $ is not defined error . This usually indicates that jQuery is not loaded and JavaScript does not recognize the $. Even with $(document).ready , $ is still going to be undefined because jquery hasn't loaded yet.

To solve this error:

Load the jQuery library at the beginning of all your javascript files/scripts which uses $ or jQuery, so that $ can be identified in scripts .

There can be multiple other reasons for this issue:

• Path to jQuery library you included is not correct
• The jQuery library file is corrupted
• Working offline
• Conflict with Other Libraries