JavaScript: Check whether a specified value is a DOM element
JavaScript Object: Exercise-18 with Solution
Write a JavaScript function to check whether a given value is a DOM element.
Sample Solution: -
HTML Code:
<html>
<head>
<meta charset="utf-8">
<title>JavaScript function to check whether a specified value is a DOM element</title>
<script
src="https://code.jquery.com/jquery-3.3.1.min.js"
integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8="
crossorigin="anonymous"></script>
</head>
<body>
</body>
</html>
JavaScript Code:
function is_dom_element(obj) {
return !!(obj && obj.nodeType === 1);
}
console.log(is_dom_element(jQuery('body')[0]));
Sample Output:
true
Flowchart:

Live Demo:
See the Pen javascript-object-exercise-18 by w3resource (@w3resource) on CodePen.
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Next: JavaScript Validation Exercisess
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JavaScript: Tips of the Day
How to remove a specific item from an array?
Find the index of the array element you want to remove using indexOf, and then remove that index with splice.
The splice() method changes the contents of an array by removing existing elements and/or adding new elements.
const array = [2, 5, 9]; console.log(array); const index = array.indexOf(5); if (index > -1) { array.splice(index, 1); } // array = [2, 9] console.log(array);
The second parameter of splice is the number of elements to remove. Note that splice modifies the array in place and returns a new array containing the elements that have been removed.
For the reason of completeness, here are functions. The first function removes only a single occurrence (i.e. removing the first match of 5 from [2,5,9,1,5,8,5]), while the second function removes all occurrences:
function removeItemOnce(arr, value) { var index = arr.indexOf(value); if (index > -1) { arr.splice(index, 1); } return arr; } function removeItemAll(arr, value) { var i = 0; while (i < arr.length) { if (arr[i] === value) { arr.splice(i, 1); } else { ++i; } } return arr; } //Usage console.log(removeItemOnce([2,5,9,1,5,8,5], 5)) console.log(removeItemAll([2,5,9,1,5,8,5], 5))
Ref: https://bit.ly/2N9nKRp
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