@mczen-technologies/tui/index.js

TUI (Tunisia’s Unique Identifier) format validator

/**
 * The unique identifier serves as the taxpayer's identifier 
 * to the tax authorities in Tunisia, it's composed of 7 digits
 * with a control key.
 * 
 * @api public
 */
class TUI {
	
	static alphabet = 'ABCDEFGHJKLMNPQRSTVWXYZ'
	
	constructor(value) {
		this.value = value
	}

	isValid() {
		const regex = new RegExp('[0-9]{7}[A-Z]')

		if (!regex.test(this.value)) return false

		const ctrlKey = Array.from(this.value.slice(0, -1), Number).reduce((prevResult, currentValue, index, array) => prevResult + currentValue * (array.length - index), 0) % 23

		return this.value.charAt(this.value.length - 1) == [...TUI.alphabet][ctrlKey]
	}
}