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JavaScript: Create a variable using a user-defined name

JavaScript Basic: Exercise-13 with Solution

Write a JavaScript exercise to create a variable using a user-defined name.

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Create a variable using a user-defined name</title>
</head>
<body>

</body>
</html>

JavaScript Code:

var var_name = 'abcd';
var n = 120;
this[var_name] = n;
console.log(this[var_name])

Sample Output:

120

ES6 Version:

const var_name = 'abcd';
const n = 120;
this[var_name] = n;
console.log(this[var_name])

Live Demo:

See the Pen javascript-object-exercise-13 by w3resource (@w3resource) on CodePen.


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JavaScript: Tips of the Day

Parse an HTTP Cookie header string and return an object of all cookie name-value pairs

Example:

const parseCookie = str =>
  str
    .split(';')
    .map(v => v.split('='))
    .reduce((acc, v) => {
      acc[decodeURIComponent(v[0].trim())] = decodeURIComponent(v[1].trim());
      return acc;
    }, {});
console.log(parseCookie('foo=bar; equation=E%3Dmc%5E2')); // { foo: 'bar', equation: 'E=mc^2' }

Output:

[object Object] {
  equation: "E=mc^2",
  foo: "bar"
}

 

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