JavaScript – Class Selector
A JavaScript selector can be used to target HTML elements by their class attribute.
JavaScript – All Elements Selector
The JavaScript querySelectorAll() selector method returns all elements that match a specified HTML tag or CSS class/ID.
JavaScript – Combination Selectors
In the following we have this HTML setup in our document and we want to select the third paragraph’s span tag.
JavaScript – First Element Selector
The querySelector() selector method returns the first element that matches a specified HTML tag or CSS class/ID.
JavaScript – #id Selector
A JavaScript selector can be used to target HTML elements by their id attribute.
JavaScript – Name Selector
A JavaScript selector can be used to target HTML elements by their name attribute.
JavaScript – Tag Selector
A JavaScript selector can be used to target HTML elements by their tag name.
JavaScript – Arithmetic Operators
JavaScript arithmetic operators are used to perform arithmetic between variables and/or values.
JavaScript – Assignment Operators
JavaScript assignment operators are used to assign values to variables.
JavaScript – Comparison Operators
JavaScript comparison operators are used in logical statements to determine equality or inequality between variables and/or values.
JavaScript – delete Operator
The delete operator deletes a property from an object. It deletes both the value of the property and the property itself.
JavaScript – in Operator
The in operator returns “true” if the specified property is in the specified object, or “false” if it is not.
JavaScript – Increment/Decrement Operators
JavaScript increment/decrement operators are used to increase or decrease a variable and/or value, and is often used in loops as a way to count iterations.
JavaScript – instanceof Operator
The instanceof operator returns true if the specified object is an instance of the specified object type.
JavaScript – Logical Operators
Logical operators are used to determine the logic between variables or values.
JavaScript – String Operators
In JavaScript, the + operator, and the += operator can be used to concatenate (bring together) multiple strings, or strings and variables.
JavaScript – Ternary Operator
The ternary (conditional) operator assigns a value to a variable based on a condition.
JavaScript – typeof Operator
The typeof operator returns the type of a variable, object, function, or expression.
JavaScript – void Operator
The void operator evaluates an expression and returns undefined, and is often used to obtain the undefined primitive value, using “void(0)”.
JavaScript – break Statement
The break statement stops code execution within the switch, and also breaks out of a loop, continuing to execute code that comes after the loop.