Change your old methods for writing a JavaScript Code - Shorthand's for JavaScript Code

Change your old methods for writing a JavaScript Code - Phonography for JavaScript Code.

We are used to writing JavaScript code for a long time. But we are not updated enough to use an optimized way of coding for JavaScript. With the optimized method of coding, we can be on top of the things which is related to optimized code. With Shorthand methods, lots of things become easy for developers, Like Error tracking, Code management, line of Codes, etc.

Here the list of javascript shorthands

1. Javascript Shorthand for if with multiple OR(||) conditions

2. Javascript Shorthand for if with multiple And(&&) conditions

3. Javascript Shorthand for checking null, undefined, and empty values of variable

4. Javascript Shorthand for switch case to select from multiple options

5. Javascript Shorthand for functions for single line function

6. Javascript Shorthand for conditionally calling functions 

7. Javascript Shorthand for To set the default to a variable using if

8. Javascript Shorthand for if…else statements

9. Javascript Shorthand for traditional for loops to fetch a value from array

10. Javascript Shorthand for typecasting, Converting string to number

1. Shorthand for if with multiple OR(||) conditions

if (car === 'audi' || car === 'BMW' || car === 'Tesla') {

    //code

}

In a traditional way, we used to write code in the above pattern. but instead of using multiple OR conditions we can simply use an array and includes. Check out the below example.

if (['audi', 'BMW', 'Tesla', 'grapes'].includes(car)) {

   //code

}

 

2. Shorthand for if with multiple And(&&) conditions

if(obj && obj.tele && obj.tele.stdcode) {

    console.log(obj.tele .stdcode)

}

Use optional chaining (?.) to replace this snippet.

console.log(obj?.tele?.stdcode);

 

3. Shorthand for checking null, undefined, and empty values of variable

if (name !== null || name !== undefined || name !== '') {

    let second = name;

}

The simple way to do it is...

const second = name || '';

 

4. Shorthand for switch case to select from multiple options

switch (number) {

  case 1:

     return 'Case one';

  case 2:

     return 'Case two';

  default:

     return;

}

Use a map/ object 

const data = {

  1: 'Case one',

  2: 'Case two'

};

//Access it using

data[num]

 

5. Shorthand for functions for single line function

 function example(value) {

  return 2 * value;

}

Use the arrow function

const example = (value) => 2 * value

 

6. Shorthand for conditionally calling functions 

function height() {

    console.log('height');

}

function width() {

    console.log('width');

}

if(type === 'heigth') {

    height();

} else {

    width();

}

Simple way 

 (type === 'heigth' ? height : width)()

 

7. Shorthand for To set the default to a variable using if

if(amount === null) {

    amount = 0;

}

if(value === undefined) {

    value = 0;

}

console.log(amount); //0

console.log(value); //0

Just Write 

console.log(amount || 0); //0

console.log(value || 0); //0

 

8. Shorthand for if…else statements

let label;

if (amt > 0) {

    label = 'profit';

} else {

    label = 'loss';

}

Replace it with a ternary operator

const label = amt > 0 ? 'profit' : 'loss';

 

9. Shorthand for traditional for loops to fetch a value from array

const arr = [1, 2, 3];

for(let i=0; i<arr.length; i++) {

    console.log(arr[i]);

}

Replace for with forEach

const arr = [1, 2, 3];
arr.forEach((val) => console.log(val));

 

10. Shorthand for typecasting, Converting string to number

const num1 = parseInt("100");

const num2 =  parseFloat("11.11");

simply use + operator

const num1 = +"100";

const num2 =  +"11.11";