Flashcards
Front end Js
Cards in this deck (18)
- 1What is Debouncing?a method of preventing a function from being invoked too often, and instead waiting a certain amount of time until it was last called before invoking it.
- 2What is one definition for Closures?Closure is when a function remembers its lexical scope even when the function is excecuted outside that lexcial scope
- 3What is one definition for Closures?When a function references a variable outside of itself , and then that function goes to some other scope and executes and it still has acces to that var.
- 4What is an example for a closureThe settimeout has access to bar, even when executed later in the program when the original scope is gone
- 5what is HoistingHoisting it´s a shorthand to describe variables belong to their enclosing functions.
- 6What do people think "Hoisting" means as a metaphorVariable declarations move to the top of the scope
- 7Name a way to decrease page loadOptimize images
*Gif for images with few colors like logos
*JPEG images with colors and details
*PGN high quality transparent img - 8Name a way to decrease page loadMinify CSS, JavaScript, and HTML.
- 9What are Higher-Order Functions in JSA “higher-order function” is a function that accepts functions as parameters and/or returns a function.
- 10what is a callbackA function passed as an argument to another function
The benefit of using a callback function is that you can wait for the result of a previous function call and then execute another function call. - 11What is the difference between an expression and a statementAn expression is a bit of JavaScript code that produces a value.
A statement is an instruction for the computer to do something. - 12What are statements (examples)Values, Operators, Expressions, Keywords, and Comments.
- 13What is a callbackA function passed as an argument to another function, when the first is done, the callback executes
A setTimeOut is an example of a callback - 14What is a PromiseA promise is an object .
It has 3 states: 1-pending, 2-resolved, 3-rejected
contains both the producing code and calls to the consuming code: - 15What is Async/AwaitSyntactic sugar for promises
If the word ASYNC comes before a function, that function returns a promise
The AWAIT makes js wait until that promise
returns a result - 16What is a function declarationa normal function that hoists
function salute(name) {
return `Hi, my name is ${name}`
} - 17What is a function ExpressionA function that is assigned to a variable that can be called.
const salute = function(name) {
return `Hi, my name is ${name}`
} - 18—
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- Flashcards on Front end Js, created by Jose Arias on 11/10/2023.
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- Jose Arias
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