Common Shorthand Techniques in JavaScript

Declaration of variables

// Longhand
let x = 1;
let y = 2;

// Shorthand
let x = 1, y = 2;

Assigning values to multiple variables

// Longhand 
let a = 1;
let b = 2, c = 3;
// Shorthand
let [a, b, c] = [1, 2, 3];

Ternary operator

// Longhand 
let marks = 7;
let result;
if(marks >= 3.5){
result = 'Pass';
} else {
result = 'Fail';
}
//Shorthand
let result = marks >= 3.5? 'Pass' : 'Fail';

Assigning default value

// Longhand 
let imagePath;
let path = getImagePath();
if(path !== null && path !== undefined && path !== '') {
imagePath = path;
} else {
imagePath = 'default.jpg';
}
// Shorthand
let imagePath = getImagePath() || 'default.jpg';

Short circuit evaluation

// Longhand 
if (isLoggedin) {
goToHomepage();
}
// Shorthand
isLoggedin && goToHomepage();

The AND(&&) short circuit shorthand is more useful in React when you want to conditionally render a component. For example:

<> { this.state.isLoading && <Loading /> } </>

Swap two variables

let x = 'Hello', y = 55; // Longhand 
const temp = x;
x = y;
y = temp;
// Shorthand
[x, y] = [y, x];

Arrow Function

// Longhand 
function add(num1, num2) {
return num1 + num2;
}

// Shorthand
const add = (num1, num2) => num1 + num2;

Template Literals

// Longhand 
console.log('You got a missed call from ' + number + ' at ' + time);
// Shorthand
console.log(`You got a missed call from ${number} at ${time}`);

Multiple condition checking

// Longhand 
if (value === 1 || value === 'one' || value === 2 || value === 'two') {
// Execute some code
}
// Shorthand 1
if ([1, 'one', 2, 'two'].indexOf(value) >= 0) {
// Execute some code
}
// Shorthand 2
if ([1, 'one', 2, 'two'].includes(value)) {
// Execute some code
}

Object Property Assignment

let firstname = 'Abhay'; 
let lastname = 'Jain';
// Longhand
let obj = {firstname: firstname, lastname: lastname};
// Shorthand
let obj = {firstname, lastname};

Repeat a string multiple times

// Longhand 
let str = '';
for(let i = 0; i < 5; i ++) {
str += 'Hello ';
}
console.log(str); // Hello Hello Hello Hello Hello
// Shorthand
'Hello '.repeat(5);

Exponent Power

// Longhand 
const power = Math.pow(4, 3); // 64
// Shorthand
const power = 4**3; // 64

Double NOT bitwise operator

// Longhand 
const floor = Math.floor(6.8); // 6
// Shorthand
const floor = ~~6.8; // 6

Max and Min number in an array

// Shorthand 
const arr = [2, 8, 15, 4];
Math.max(...arr); // 15
Math.min(...arr); // 2

For loop

let arr = [10, 20, 30, 40]; //Longhand 
for (let i = 0; i < arr.length; i++) {
console.log(arr[i]);
}
// Shorthand
// for of loop
for (const val of arr) {
console.log(val);
}
// for in loop
for (const index in arr) {
console.log(`index: ${index} and value: ${arr[index]}`);
}

Merging of arrays

let arr1 = [20, 30];// Longhand 
let arr2 = arr1.concat([60, 80]);
// [20, 30, 60, 80]
// Shorthand
let arr2 = [...arr1, 60, 80];
// [20, 30, 60, 80]

Get character from string

let str = 'jscurious.com'; // Longhand 
str.charAt(2); // c
// Shorthand
str[2]; // c

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Abhay Jain

Abhay Jain

Developer with 3 yrs of industrial experience in developing scalable web applications.