How to Evaluate Formulas in Go Using the `govaluate` Package?

Evaluating Formulas in Go

In Python, the parser module offers a convenient way to evaluate formulas using pre-defined values. A sample code using this module is provided below:

x = 8
code = parser.expr("(x + 2) / 10").compile()
print eval(code)
# prints 1

To achieve similar functionality in Go, the govaluate package is a reliable option. It allows for the evaluation of complex formulas involving numeric values, operators, and functions.

The usage of govaluate is straightforward. The code snippet below demonstrates its application:

expression, err := govaluate.NewEvaluableExpression("(x + 2) / 10")

parameters := make(map[string]interface{}, 8)
parameters["x"] = 8

result, err := expression.Evaluate(parameters)

In this example, the formula to be evaluated is represented as a string. The NewEvaluableExpression function compiles the formula into an internal representation for efficient evaluation.

Next, a map of parameter values is defined. The map keys represent variable names used in the formula, while the values are the corresponding numeric values.

Finally, the Evaluate function is called to compute the result of the formula using the provided parameter values. The result obtained is a float64 value.

The govaluate package provides a robust and efficient way to evaluate formulas in Go, making it a valuable tool for scientific computing, data analysis, and other applications where formula evaluation is required.

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