Whats the difference between JS Number.MAX_SAFE_INTEGER and MAX_VALUE?

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Number.MAX_SAFE_INTEGER is the largest integer which can be used safely in calculations.

For example, Number.MAX_SAFE_INTEGER + 1 === Number.MAX_SAFE_INTEGER + 2 is true — any integer larger than MAX_SAFE_INTEGER cannot always be represented in memory accurately. All bits are used to represent the digits of the number.

Number.MAX_VALUE on the other hand is the largest number possible to represent using a double precision floating point representation. Generally speaking, the larger the number the less accurate it will be.

More information double-precision floating point numbers on Wikipedia

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