Curious about the functionality of
array.prototype.includes.call(x, y);Discovered that includes() confirms if an array has the specified value and provides a true or false result.
Learned that call() invokes this alongside any optional arguments.
The confusion lies in understanding the outcome when these methods are combined as shown above.
Let's dive into the explanation provided by Mozilla Developer:
The
includes()method is versatile as it does not specifically require an Array object, making it applicable to various other types of objects (such as array-like objects).An example demonstrating the use of the
includes()method on the function's arguments object is showcased below.(function() { console.log(Array.prototype.includes.call(arguments, 'a')) // true console.log(Array.prototype.includes.call(arguments, 'd')) // false })('a','b','c')
While array-like objects share similarities with Arrays (like having a length property), they lack functionalities such as map and slice. Another instance of an array-like object is HTMLCollection, obtainable through
document.getElementsByTagName('div')document.getElementsByTagName('div').__proto__[].__proto will reveal differences in their getters and setters, although both provide the length property.
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