Ayodele Samuel Adebayo
Unclebigbay's ๐Ÿš€ Blog

Unclebigbay's ๐Ÿš€ Blog

JavaScript Syntax

JavaScript Syntax profile { }, [ ], ( ) and more ...

Ayodele Samuel Adebayo
ยทAug 17, 2021ยท

3 min read

JavaScript Syntax

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Hello, my gorgeous friends on the internet ๐Ÿ‘‹

Below are lists of JavaScript syntax with their information broken down into profile details and examples.

I hope you find this helpful, let's get started.

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1. [ ]

English Name: Square Brackets

JavaScript Use: To declare an Array

Example ๐Ÿ‘‡:

const favouriteFruits = [ "Mango", "Pawpaw", "Cashew" ];

2. { }

English Name: Curly brackets or braces

JavaScript Use: To create an Object Literal

Example ๐Ÿ‘‡:

const favouriteBloggers = {
name: "Mr. Tapas", 
site: "blog.greenroots.info"
}

3. ( )

English Name: Parentheses

JavaScript Use: To invoke functions or methods.

Example ๐Ÿ‘‡:

const newFunction = ()=>{

// log() method
    console.log("๐Ÿ˜Ž");
}

// Invoke function()
newFunction()

4. ...

English Name: 3 dots, full stops or periods

JavaScript Name: Spread Operator

JavaScript Use: To merge 2 or more arrays together

Example ๐Ÿ‘‡:

const halfName = ["uncle"];

const otherhalfName = ["Bigbay"];

console.log(...arrayOfHalfName, ...otherHalfName)

Output ๐Ÿ”Ž

image.png


5. ??

English Name: Question Marks

JavaScript Name: The nullish coalescing operator

JavaScript Use: To return the right-hand operand when the left-hand operand is null or undefined

Example ๐Ÿ‘‡:

const formField = null; // replace with a value

const formResponse = formField ?? "This Field is required";

console.log(formResponse);

6. &&

English Name: And

JavaScript Name: Logical AND

JavaScript Use: To return the right-hand operand when the left-hand operand is not "false"

Example ๐Ÿ‘‡:

const isUserLoggedIn = true; // Change to false or string

const authenticationStatus = isUserLoggedIn && "Yes, ๐Ÿ˜€";

console.log(authenticationStatus);

7. ||

English Name: Vertical Bar

JavaScript Name: Logical OR

TypeScript Name: Double Pipe Operator

JavaScript Use: Returns true if any of the conditions in an expression is true.

Example ๐Ÿ‘‡:

// Recruitment application ๐Ÿ˜Ž

const webDeveloper = true;

const hasExperience = false;

// Qualified if any of the condition is true

const qualified = webDeveloper || hasExperience;

if (qualified) {

  console.log("You're welcome onboard ๐Ÿค—");

} else {

  console.log("You are not one of us ๐Ÿ˜ญ");

}

Output ๐Ÿ”Ž

image.png


8. ? :

English Name: Unknown ๐Ÿ˜œ

JavaScript Name: Ternary Operator

JavaScript Use: Alternative to if else block

Example ๐Ÿ‘‡:


const finalExamDay = 19;

// If final exam day is zero, I am happy else I really don't enjoy school

const mood = finalExamDay === 0 ? "Happy, coding time ๐Ÿ’ƒ" : "I hate school ๐Ÿ˜ฅ";

console.log(mood);

Output ๐Ÿ”Ž

image.png


9. ++ Operand

English Name: Plus Sign

JavaScript Name: Increment

JavaScript Use: To increase its operand by one (1) and return a new value

Example ๐Ÿ‘‡

let point = 0;

const makePoint = ++point;

console.log(makePoint);

Output ๐Ÿ”Ž

image.png


10. -- Operand

English Name: Minus Sign

JavaScript Name: Decrement

JavaScript Use: To deduct one (1) from its operand and return a new value

Example ๐Ÿ‘‡

let point = 1;

const losePoint = --point;

console.log(losePoint);

Output ๐Ÿ”Ž

image.png


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