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JavaScript: Hide email addresses to protect from unauthorized user

JavaScript String: Exercise-6 with Solution

Write a JavaScript function to hide email addresses to protect from unauthorized user.

Test Data:
console.log(protect_email("[email protected]"));
"[email protected]"

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Hide email addresses to protect from unauthorised user</title>
</head>
<body>
</body>
</html>

JavaScript Code:

protect_email = function (user_email) {
    var avg, splitted, part1, part2;
    splitted = user_email.split("@");
    part1 = splitted[0];
    avg = part1.length / 2;
    part1 = part1.substring(0, (part1.length - avg));
    part2 = splitted[1];
    return part1 + "[email protected]" + part2;
};

console.log(protect_email("[email protected]"));

Sample Output:

[email protected]

Flowchart:

Flowchart: JavaScript- Hide email addresses to protect from unauthorized user

Live Demo:

See the Pen JavaScript Hide email addresses to protect from unauthorized user - string-ex-6 by w3resource (@w3resource) on CodePen.


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JavaScript: Tips of the Day

var functionName = function() {} vs function functionName() {}

The difference is that functionOne is a function expression and so only defined when that line is reached, whereas functionTwo is a function declaration and is defined as soon as its surrounding function or script is executed (due to hoisting).

For example, a function expression:

// TypeError: functionOne is not a function
functionOne();

var functionOne = function() {
  console.log("Hello!");
};

Historically, function declarations defined within blocks were handled inconsistently between browsers. Strict mode (introduced in ES5) resolved this by scoping function declarations to their enclosing block.

'use strict';    
{ // note this block!
  function functionThree() {
    console.log("Hello!");
  }
}
functionThree(); // ReferenceError

Ref: https://bit.ly/2zMAj1O