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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

Checks if the provided argument is array-like (i.e. is iterable)

Example:

const isArrayLike = obj => obj != null && typeof obj[Symbol.iterator] === 'function';
console.log(isArrayLike(document.querySelectorAll('.className'))); // true
console.log(isArrayLike('abc')); // true
console.log(isArrayLike(null)); // false

Output:

true
true
false