safe-evaluate-expression

safe-evaluate-expression

Small library to dynamically create and evaluate expression with multiple parameters (even undefined).

Installation

npm install safe-evaluate-expression

Example

const evaluate = require("safe-evaluate-expression");

const isUndefined = (x) => (x === undefined ? true : false);
const isEqual = (a, b) => a === b;

const operators = { isUndefined, isEqual };
const vars = { a: 1, b: 1, c: 2 };
const params = { ...vars, ...operators };

evaluate("isEqual(a,b)", params); // -> true
evaluate("isEqual(a,c)", params); // -> false
evaluate("isEqual(a,notDefined)", params); // -> false
evaluate("isUndefined(a)", params); // -> false
evaluate("isUndefined(notDefined)", params); // -> true