Boolean values are converted to numbers before comparisons are made with the equal operator (==) and not equal operator (!=). Comparisons where one operand is a string and the other is a number converts the string to a number first. If one of the operands is an object and not the other then the object […]
JavaScript Equality Operators Read More »
Values used in JavaScript multiplication are converted to numbers with the Number() casting function before they are used in the operation. Empty strings will become 0 and Boolean true will become 1. Addition on strings concatenates the two strings. If one of the operators is a string and the other is not, the non-string is
JavaScript Operators Read More »
JavaScript uses the increment (++) and decrement (–) on all data types. Putting the operator before the variable will change the value before the final evaluation of the statement. Putting the operator after the variable will change the value after the evaluation. Using the increment/decrement operator on a string first converts the value to a
JavaScript Objects, Unary Operators and Logical Operators Read More »
\n inside the string is used for ‘new line’ and \t is used for ‘tab’. Once a string has been defined in JavaScript it’s value can not change. To get around this, when you use operators to change the string, a new string is created and the old string is destroyed, all behind the scenes.
JavaScript Strings Read More »
JavaScript’s NaN stands for ‘Not a Number’. This is used when an operation that should have returned a number has failed. NaN used in any operation will always return NaN. NaN is not equivalent to any value, including itself. (NaN == NaN) returns false. You can test this value with the isNaN() function. Booleans, strings
JavaScript Numbers: Number(), parseInt(), parseFloat() Read More »
Uninitialized variables show as a type of undefined. So do variables that haven’t been declared at all. We should always initialize variables so that we know that undefined means we haven’t declared the variable. null is an empty object pointer. We should initialize objects to null so that the typeof will return the correct data
JavaScript Variables: Initialization, Booleans, and Numbers Read More »
Everything in JavaScript is case-sensitive. Characters in an identifier name (variable, function or property) can be letters, numbers, underscore or dollar sign. The first character can not be a number. Of course, keywords can not be used as identifiers. Using camelCase for identifiers is the best case practice. Comments in JavaScript are // for single
JavaScript Identifiers and Conventions Read More »
I have decided to spend more of my time and energy learning more JavaScript and to keep the notes here for me to look back at, as well as to help others who may also be interested in learning more JavaScript programming. I don’t think JavaScript is going away anytime soon because it’s now on
One of my clients complained that her users were contacting her quite often because they had forgotten their username. Of course, the username is listed in the email if you click on ‘forgot password’, but many novice users don’t know that or don’t think to click there to find their username. I figured that should
Allow Users to Login with Email Address OR Username in WordPress Read More »
Well, that’s 8 hours of my life I can’t get back. But, I learned a lot! My WordPress website using the s2Member plugin was supposed to redirect my subscribers to the Welcome Page that I had set up AND it was supposed to hide the wp-admin screens from them. But, every time I logged in,
