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Why JavaScript? History of JS Browser-side scripting language AJAX -> refreshing specific parts only, not the whole page -> increasing UX performance V8 engine in Chrome -> fast Node.js -> server dev. enhancement JS = FE + BE + DB(MongoDB) = Ful...
let, const before 2015, var was used to declare a variable after 2015, let and const were introduced Arrow Function // original ways to declare function function add() {} var add = function () {}; // arrow function var add = () => { return ...
Data Type and Memory Primitive Type vs Reference Type Primitive Type: String, Number, Undefined, Bool, BigInt, Symbol Way to Copy: copy the address where the value is contained Immutable Reference Type: Object Way to Copy: copy the address th...
Execution Context The execution context in JavaScript is an OBJECT that gathers environmental information to provide the code to be executed. When a certain execution context is activated, JavaScript performs the following actions: It hoists declare...
Callback Function A function that is passed as a parameter into another function In other words, a callback function is a function that delegates its control to another code (function or method) by passing itself as an argument. The code that receive...
Sync vs. Async Sync: one after another Async: one after another, but not necessarily in order Blog - Sync, Async, Event Loop, and Task Queue The more complicated the web is, the more asynchronous codes are needed However, asynchronous does no...
