JavaScript more efficient and readable code for make a calculator with only 20 lines with

Eval Function for a Calculator

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This is very very best way to improve and make efficient for our code. The eval() function is very helpful to make efficient, readable and maintainable. As we know about eval() function the eval() is a function property of the global object. The argument of the eval() function is a string. It will evaluate the source string as a script body, which means both statements and expressions are allowed. It returns the completion value of the code. For expressions, it's the value the expression evaluates to.

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