check if an element exists

to check if an element exists in a collection or array, you can use various programming languages provide built-in functions or methods to perform this task. i will provide examples in python and javascript to demonstrate how to check if an element exists in a list or an array.

### python example:
in python, you can use the `in` operator to check if an element exists in a list. here is an example:

### javascript example:
in javascript, you can use the `includes()` method to check if an element exists in an array. here is an example:

in both examples, we are checking if the element `3` exists in the list/array. you can replace `element_to_check` or `elementtocheck` with any other value you want to check for existence.

these examples demonstrate how to check if an element exists in a collection using python and javascript. the `in` operator in python and the `includes()` method in javascript are commonly used for this purpose.

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