Sep 9, 2021 JavaScript
How to check if all items in an array are equal in JavaScript

In this Article we will go through how to check if all items in an array are equal only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

const areEqual = arr => arr.length > 0 && arr.every(item => item === arr[0]);

Sep 9, 2021 JavaScript
How to check if an array contains a value matching some criterias in JavaScript

In this Article we will go through how to check if an array contains a value matching some criterias only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

const contains = (arr, criteria) => arr.some(v => criteria(v));

Sep 9, 2021 JavaScript
How to check if a value is a regular expression in JavaScript

In this Article we will go through how to check if a value is a regular expression only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

const isRegExp = value => Object.prototype.toString.call(value) === '[object RegExp]';

Sep 9, 2021 JavaScript
How to check if a value is a string in JavaScript

In this Article we will go through how to check if a value is a string only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

const isString = value => Object.prototype.toString.call(value) === '[object String]';

Sep 9, 2021 JavaScript
How to check if a value is an object in JavaScript

In this Article we will go through how to check if a value is an object only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

const isObject = v => (v !== null && typeof v === 'object');

Sep 9, 2021 JavaScript
How to check if a value is base32 encoded in JavaScript

In this Article we will go through how to check if a value is base32 encoded only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

const isBase32 = value => value.length % 8 === 0 && /^[A-Z2-7]+=*$/.test(value);

Sep 9, 2021 JavaScript
How to check if a value is base58 encoded in JavaScript

In this Article we will go through how to check if a value is base58 encoded only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

// It doesn't accept the I, O, l characters 
const isBase58 = value => /^[A-HJ-NP-Za-km-z1-9]*$/.test(value);

Sep 9, 2021 JavaScript
How to check if a string is lower case in JavaScript

In this Article we will go through how to check if a string is lower case only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

const isLowerCase = str => str === str.toLowerCase();

Sep 9, 2021 JavaScript
How to check if a string is upper case in JavaScript

In this Article we will go through how to check if a string is upper case only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

const isUpperCase = str => str === str.toUpperCase();

Sep 9, 2021 JavaScript
How to check if a value is a business identifier code in JavaScript

In this Article we will go through how to check if a value is a business identifier code only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

const isBIC = value => /^[a-zA-Z]{6}[a-zA-Z0-9]{2}([a-zA-Z0-9]{3})?$/.test(value);