The $() function
The dollar function, $(), can be used as shorthand for the getElementById function. To refer to an element in the Document Object Model (DOM) of an HTML page, the usual function identifying an element is: document.
How do I understand this keyword?
- By default, this refers to the global object.
- In a function, when not in strict mode, this refers to the global object.
- In a function, when in strict mode, this is undefined .
- In an arrow function, this retains the value of the enclosing lexical context’s this .
The this keyword of the clickMe arrow function refers to the global object, in this case the window object. So, this. … color will be undefined because our window object does not know anything about the position or the color properties.
How do I use this keyword in Arrow?
Arrow functions treat this keyword differently. They don’t define their own context since it doesn’t have its own this context. They inherit that from the parent scope whenever you call this . this in regular function always refers to the context of the function being called.
Why we use this keyword in typescript?
The “this” keyword always points to the object that is calling a particular method. … In a constructor, member function, or member accessor, this is of the class instance type of the containing class. In a static function or static accessor, this is of the constructor function type of the containing class.
Currying is a technique of evaluating function with multiple arguments, into sequence of functions with single argument.In other words, when a function, instead of taking all arguments at one time, takes the first one and return a new function that takes the second one and returns a new function which takes the third …
What is the difference between the operators == & ===?
In one word, main difference between “==” and “===” operator is that formerly compares variable by making type correction e.g. if you compare a number with a string with numeric literal, == allows that, but === doesn’t allow that, because it not only checks the value but also type of two variable, if two variables are …
The equality operator ( == ) checks whether its two operands are equal, returning a Boolean result. Unlike the strict equality operator, it attempts to convert and compare operands that are of different types.