Incorrect code in javascript.md#writing-reusable-javascript

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Quote from chapter:
https://github.com/se-edu/learningresources/blob/master/contents/javascript/javascript.md#writing-reusable-javascript

Method chaining is syntax such as array.concat([1, 2]).push(1).filter(isEven)

However, Array.prototype.push doesn't return an array, the above code doesn't do what it intends to do.