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https://stackoverflow.com/a/7792256
Older IEs do not support indexOf for Array, so you should have a shim for them anyways. That includes not only older IEs, but also older versions of other browsers - they are also used nowadays. – Aux Oct 17 '11 at 10:21
http://www.pearweb.com/javascript/array-index-of.html
While trying to do an indexOf on a Javascript array I created [arrayName.indexOf("joe")] I discovered that it wouldn't work in Internet Explorer! IE does not support this method for array's! So A quick search on the web lead me to soledad penadés web site where I discovered a simple solution.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf
If the index is greater than or equal to the array's length, -1 is returned, which means the array will not be searched. If the provided index value is a negative number, it is taken as the offset from the end of the array.4%
https://www.w3schools.com/jsref/jsref_indexof_array.asp
The indexOf() method searches the array for the specified item, and returns its position. The search will start at the specified position, or at the beginning if no start position is specified, and end the search at the end of the array. Returns -1 if the item is not found.
https://dev.to/adroitcoder/includes-vs-indexof-in-javascript
You forgot to mention one of the main differences between includes() and indexOf(). IE does not support includes() whereas it supports the other.
https://stackoverflow.com/questions/2608575/jquery-split-and-indexof-results-in-object-doesnt-support-this-property-or-m
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find
The find method does not mutate the array on which it is called, but the function provided to callback can. ... If you need to support truly obsolete JavaScript engines that don't support Object.defineProperty, ... Array.prototype.indexOf() Array.prototype.join() Array.prototype.keys()
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes
includes() method is intentionally generic. It does not require this value to be an Array object, so it can be applied to other kinds of objects (e.g. array-like objects). The example below illustrates includes() method called on the function's arguments object.
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