Javascript Program for masking email and phone number

• Here is the two different function that receive email and phone and return masked value.

    export const maskEmail = (email) => {

        if (email) {

            // Split the email into local and domain parts

            const atIndex = email.indexOf('@');

            if (atIndex === -1) {

                // If no '@' symbol is found, return the original email

                return email;

            }

            const localPart = email.substring(0, atIndex);

            const domainPart = email.substring(atIndex);

            // Determine how many characters to mask in the local part

            let maskedPartLength = localPart.length - 3;

            if (maskedPartLength < 1) {

                // If the local part is too short, adjust the number of visible characters

                maskedPartLength = localPart.length > 1 ? 1 : 0;

            }

            // Create the masked part

            const maskedPart = '*'.repeat(maskedPartLength);

            const visiblePart = localPart.substring(0, localPart.length - maskedPartLength);

            // Combine the visible part, masked part, and domain part

            return `${visiblePart}${maskedPart}${domainPart}`;

        } else {

            return "****@****.com"

        }

    }

    export const maskPhoneNumber = (phoneNumber) => {

        if (phoneNumber) {

            // Check if the phone number has less than 4 digits

            if (phoneNumber.length <= 4) {

                return phoneNumber; // Return the original if too short to mask

            }

            // Mask all but the last four digits

            const visiblePart = phoneNumber.slice(-4);

            const maskedPartLength = phoneNumber.length - 4;

            const maskedPart = '*'.repeat(maskedPartLength);

            // Combine the masked part and the visible part

            return `${maskedPart}${visiblePart}`;

        } else {

            return "**** **** ****"

        }

    }