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String substitution In the context of building a database query like so: CREATE TABLE fish (nam...

Time before OAuth Before OAuth was invented, a common way to give third-party application access...

Monolithic os Every hardware service that it will provide or every service that an application t...

Two different standards In the browser JavaScript ecosystem, JavaScript modules depends on impor...

async keyword async keyword is placed before a function like so: async function f() { return ...

Promise.all This API will allow us to take in an iterable, an array of promises and return a new...

Syntax try { // Code } catch (err) { // Error handling } finally { // Excuted always,...

Virtual property In addition to the normal property that we have for objects, we can also set up...

Objects In JavaScript objects are used to store key to value pair collection of data. You can th...

JSON file When you want to transport say a complicated object or an array of object to another c...

Destructuring assignment A special syntax to let us unpack either array or object into different...

Map Very similar to an object, however, with object the only key that is allowed is a String. Ma...

Iterables A generalization of arrays, it allows us to make any object iterable in the context of...

Array Two ways of creating empty array let arr = new Array(); let arr = []; Create an array w...

Symbols In JavaScript there is two primitive types that can be used as object property key St...

Optional chaining There is this problem that if the object that you are accessing might or might...

Constructor function Function that is meant to be a constructor are named with capital letter fi...

Script tag You can insert JavaScript program into HTML document using the <script> tags. You ca...

Reachability In JavaScript garbage collection is implemented through something called reachabili...

Function Declaration To declare a function follow the syntax: function function_name(parameter1...