API v3.0.x

Installation:

npm: npm install @hapi/formula

yarn: yarn add @hapi/formula

Methods

`new Formula.Parser(formula, [options])`

Creates a new formula parser object where:

formula - the formula string to parse.
options - optional settings:
- constants - a hash of key-value pairs used to convert constants to values.
- tokenRx - a regular expression used to validate token variables.
- reference - a variable resolver factory function with signature function(variable) which returns a function with signature function(context) returning the resolved variable.
- functions - a hash of key-value pairs used to resolve formula functions.

`parser.evaluate([context])`

Evaluate the formula where:

context - optional object with runtime formula context used to resolve variables.

Returns the string or number outcome of the resolved formula.