call() - Calls a function with a given this value and arguments provided individually - Function Borrowing.
apply() - Calls a function with a given this value, and arguments provided as an array.
bind() - Creates a new function that, when called, has its this keyword set to the provided value, with a given sequence of arguments.
Polyfill for bind() - Create your own implementation for bind()
Function Currying - Can be achieved using bind() or closures.
Debouncing - Debouncing is a programming practice used to ensure that time-consuming tasks do not fire so often, that it stalls the performance of the web page.
async/defer -
Event Capturing/Event Trickling - Event listeners are propagated from parent to child direction in DOM tree/hierarchy. Event Listener's 3rd parameter is 'useCapture' which is by default false i.e. dafault behavior is event bubbling. Capturing is the 1st phase of event propagation cycle.
Event Bubbling - Event listeners are propagated from child to parent direction in DOM tree/hierarchy. Bubbling is the 2nd phase of event propagation cycle.
Event Delegation - The idea is that if we have a lot of elements handled in a similar way, then instead of assigning a handler to each of them – we put a single handler on their common ancestor.
Implement function sum(a)(b)(c)(d)...() upto any number of parameters.
Prototype and prototypal inheritance - When it comes to inheritance, JavaScript only has one construct: objects. Each object has a private property which holds a link to another object called its prototype. That prototype object has a prototype of its own, and so on until an object is reached with null as its prototype. By definition, null has no prototype, and acts as the final link in this prototype chain.
Nearly all objects in JavaScript are instances of Object which sits on the top of a prototype chain. [arr.proto is Array.Prototype]
[arr.proto.proto is Object.Prototype]
[arr.proto.proto is null]
Similarly, [fun.proto is Object.Prototype]
Cross Origin Resource Sharing - https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS
Throttling - Throttling is a technique in which, no matter how many times the user fires the event, the attached function will be executed only once in a given time interval.