Javascript Code Dump By Vatsal Patel

ID : 1 & Title : null vs UndefinedID : 2 & Title : for In vs for of (in for obj & of for array) ID : 3 & Title : IIFEID : 4 & Title : The conditional (ternary) operator(?)ID : 5 & Title : parameters vs argumentsID : 6 & Title : Function ExpressionsID : 7 & Title : hoisting

definition of hoisting suggests that variable and function declarations are physically moved to the top of your code, but this is not in fact what happens. Instead, the variable and function declarations are put into memory during the compile phase, but stay exactly where you typed them in your code.

it allows you to use a function before you declare it in your code.

The variables can be initialized and used before they are declared.

JavaScript only hoists declarations, not initializations. If a variable is declared and initialized after using it, the value will be undefined.

console.log(num); // Returns undefined, as only declaration was hoisted, no initialization has happened at this stage
var num; // Declaration
num = 6; // Initialization

Initializations using let and const are also not hoisted.

// Example with let:
a = 1; // initialization.
let a; // Throws ReferenceError: Cannot access 'a' before initialization

// Example with const:
a = 1; // initialization.
const a; // Throws SyntaxError: Missing initializer in const declaration

JavaScript in strict mode does not allow variables to be used if they are not declared.

ID : 8 & Title : Template literal backtick (`)ID : 9 & Title : Expressions ${} syntaxID : 10 & Title : Tagged TemplatesID : 11 & Title : Rest parameter ... (must be last parameter )ID : 12 & Title : Avoid Wrong Array copy methodID : 13 & Title : spread operator for copying arrayID : 14 & Title : Array Expand concatenate using spread operatorID : 15 & Title : Math operation on arrayID : 16 & Title : spread operator VS a rest parameterID : 17 & Title : destructuring-assignment,destructuring-assignment,Array to variableID : 18 & Title : swap-the-values-of-two-variables-in-javascriptID : 19 & Title : exponentiation-operatorID : 20 & Title : trunc vs floor vs ceil vs roundID : 21 & Title : Live and static DOM elementsID : 22 & Title : parseInt second parameter,..... ID : 23 & Title : JavaScript closureID : 24 & Title : async and deferID : 25 & Title : this keywordID : 26 & Title : JavaScript single-threaded and has a synchronous execution model

JavaScript is inherently single-threaded and has a synchronous execution model, which means that code is executed in a sequential and blocking manner by default. Each line of code is executed one after the other, and the program waits for each operation to complete before moving on to the next.

However, JavaScript also has mechanisms to handle asynchronous operations, allowing non-blocking execution. Asynchronous operations, such as fetching data from a server or reading files, do not halt the program's execution while waiting for a response. Instead, they are initiated, and the program continues to execute other tasks without waiting for the asynchronous operation to complete.

The main difference between synchronous and asynchronous code execution is how they handle waiting for operations to finish:

Synchronous Execution:

Code is executed in a sequential and blocking manner.
Each operation must complete before the program moves to the next one.
The program waits for I/O operations or time-consuming tasks to finish, blocking further execution.
Asynchronous Execution:

Code is executed non-sequentially, allowing other operations to proceed while waiting for a particular operation to complete.
Asynchronous operations are initiated, and the program continues executing without waiting for them to finish.
A callback function or promises are typically used to handle the completion of asynchronous operations and perform further actions.
Asynchronous execution is crucial for handling time-consuming tasks without blocking the main thread, which would result in unresponsive user interfaces or slow performance. JavaScript provides mechanisms like callbacks, promises, and async/await to handle asynchronous code in a more organized and readable way.

By using asynchronous techniques, JavaScript can efficiently handle I/O operations, network requests, and other time-consuming tasks, providing a more responsive and performant user experience.

ID : 27 & Title : polyfillID : 28 & Title : scope