string-masking/index.js

to mask string

function stringMask(string, digit) {
	try {
		let model = {}
		let note = "Please email us on rohansolse@gmail.comfor NPM related suggestions/bugs (with input)."
		if (!string || digit == undefined) {
			model.status = "failure"
			model.response = "Ethier string, digit or both are missing or misplaced."
			model.NOTE = note
			return (model)
		}
		if (typeof (string) == 'number') {
			string = JSON.stringify(string)
		}
		if (typeof (digit) == 'string') {
			digit = parseInt(digit)
		}
		if (string == "") {
			model.status = "failure"
			model.response = "Blank string cannot be processed"
			model.NOTE = note
			return (model)
		}
		if (string.length <= digit) {
			model.status = "failure"
			model.response = "Entered string length cannot be equal to greater than the digit count"
			model.NOTE = note
			return (model)
		}

		if (digit == 0) {
			let data = []
			if (string.length < 3) {
				model.status = "failure"
				model.response = "Entered strings length is too less for this operation."
				model.NOTE = note
				return (model)
			}
			if (string.length == 3) {
				model.status = "success"
				model.response = string.charAt(0) + "X" + string.charAt(2)
				return (model)
			}
			let unmaskNo = parseInt(((string.length / 35) * 10))
			for (let i = 0; i < unmaskNo; i++) {
				data.push(string.charAt([i]))
			}
			let secondunMask = string.length - ((unmaskNo * 2))
			for (let i = 0; i < secondunMask; i++) {
				data.push("X")
			}
			let remainingStr = string.slice((unmaskNo + secondunMask), string.length)
			for (let i = 0; i < unmaskNo; i++) {
				data.push(remainingStr.charAt([i]))
			}
			data = data.join('')
			model.status = "success"
			model.response = data
			return (model)
		} else if (digit > 0) {
			let data = []
			let unmaskNo = string.length - digit
			let unMask = string.slice(unmaskNo, string.length)
			if (unMask.includes(" ")) {
				model.status = "failure"
				model.response = "unmasking value can not be blank"
				model.NOTE = note
				// console.log(model)
				return (model)
			}
			for (let i = 0; i < unmaskNo; i++) {
				data.push("X")
			}
			data.push(unMask)
			data = data.join('')
			model.status = "success"
			model.response = data
			// console.log(model)
			return (model)
		} else {
			if (string.length <= (digit * -1)) {
				model.status = "failure"
				model.response = "Entered string length cannot be equal to greater than the digit count"
				model.NOTE = note
				return (model)
			}
			let data = []
			digit = digit * -1
			let maskNo = string.length - digit
			let unmaskNo = string.length - maskNo
			for (let i = 0; i < unmaskNo; i++) {
				data.push(string.charAt([i]))
			}
			for (let i = 0; i < maskNo; i++) {
				data.push("X")
			}
			data = data.join('')
			model.status = "success"
			model.response = data
			// console.log(model)
			return (model)
		}
	} catch (e) {
		let model = {}
		model.status = "failure"
		model.response = "Something went wrong, Please check the syntax."
		model.NOTE = note
		return (model)
	}

}

module.exports = stringMask