JavaScript: Get the first element of an array
JavaScript Array: Exercise-1 with Solution
Write a JavaScript function to check whether an 'input' is an array or not.
Test Data:
console.log(is_array('w3resource'));
console.log(is_array([1, 2, 4, 0]));
false
true
Sample Solution:
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JS Bin</title>
</head>
<body>
</body>
</html>
JavaScript Code:
var is_array = function(input) {
if (toString.call(input) === "[object Array]")
return true;
return false;
};
console.log(is_array('w3resource'));
console.log(is_array([1, 2, 4, 0]));
Sample Output:
false true
Flowchart:

ES6 Version:
var is_array = input => {
if (toString.call(input) === "[object Array]")
return true;
return false;
};
console.log(is_array('w3resource'));
console.log(is_array([1, 2, 4, 0]));
Live Demo:
See the Pen JavaScript - Get the first element of an array- array-ex-1 by w3resource (@w3resource) on CodePen.
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Next: Write a JavaScript function to clone an array.
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JavaScript: Tips of the Day
How do I redirect to another webpage?
window.location.replace(...) is better than using window.location.href, because replace() does not keep the originating page in the session history, meaning the user won't get stuck in a never-ending back-button fiasco.
If you want to simulate someone clicking on a link, use location.href
If you want to simulate an HTTP redirect, use location.replace.
// similar behavior as an HTTP redirect window.location.replace("http://stackoverflow.com"); // similar behavior as clicking on a link window.location.href = "http://stackoverflow.com";
Ref: https://bit.ly/37JdWH8
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