text: function getIpv4MappedIpv6Address(ipv4) {
  	  // Initialize return argument
  	  let ipv6Address = null;
  	
  	  // Prepare to derive a Hex version of the dotted-quad decimal IPv4 address.
  	  // Split the IPv4 address into its four parts.
  	  let ipv4Quads = ipv4.split('.');
  	  // Count the number of parts found.
  	  let numIpv4Segments = ipv4Quads.length;
  	
  	 // Verify IPv4 had four parts.
  	  if (numIpv4Segments === 4) {
  	    let validQuads = true;
  	    // Iterate over the IPv4 address parts and verify each segment was a number between 0 and 255.
  	    for(let i=0; i < numIpv4Segments; i++) {
  	      if( isNaN(Number(ipv4Quads[i])) || ipv4Quads[i] < 0 || ipv4Quads[i] > 255 ) {
  	        validQuads = false;
  	      }
  	    }
  	    // Passed IPv4 is valid. Now to derive an IPv4-mapped IPv6 address.
  	    if (validQuads) {
  	      // Hardcode the prefix. During refactor, we might want to make the prefix a const.
  	      ipv6Address = "0:0:0:0:0:ffff:";
  	      // Iterate over the IPv4 parts
  	      for(let i=0; i < numIpv4Segments; i++) {
  	        // Convert part to an integer, then convert to a hex string using method toString()
  	        // with a base 16 (hex) encoding.
  	        let hexString = parseInt(ipv4Quads[i]).toString(16);
  	        // If hex is odd (single digit), prepend a '0'. This is why we wanted to work with a string.
  	        if (hexString.length % 2)
  	          hexString = '0' + hexString;
  	        // Append hex part to evolving variable ipv6Address.
  	        ipv6Address = ipv6Address + hexString;
  	        // Add a colon to split the encoded address and match the IPv6 format.
  	        if(i===1) {
  	          ipv6Address = ipv6Address + ':';
  	        }
  	      }
  	    }
  	  }
  	  return ipv6Address;
  	}
  
        module.exports.getIpv4MappedIpv6Address = getIpv4MappedIpv6Address;
  