Skip to main content

Understanding JavaScript Events and Functions

Event Delegation​

JS event listeners fire not only on a single DOM element, but on all its descendants.

Event Bubbling​

Inverse of Event Delegation. Also known as propogation, events on an element will " "bubble up" and also fires on all parents.

Difference between "target" and "currentTarget"​

"target" is the actual element that triggered the event, and "currentTarget" is the element with the listener attached.

function foo() {
    // this is a definition or statement
}

var foo = function() {
    // this is an expression
    // this resolves to a value, even if just "undefined"
}

Functions as expressions vs definition

MDN - An expression is any valid unit of code that resolves to a value.

What is the difference between == and ===​

  • \== to checks for equality
  • \=== checks for equality and type

Difference between call stack and task queue​

https://www.toptal.com/javascript/interview-questions