It is obvious that ‘.’ before a number will be recognized as a decimal point, which is different from the point that gets a property. For example, .2===0.2 is true. What’s more, the array’s prototype is object, which means arr[-1] will get the value of -1 rather than length-1. The array can store values at -1 like other objects. If you use -1 to represent length-1, so how do we refer to the value of -1?
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