README.md

cheap-eval

Fast, dependency free object evaluation engine for JavaScript. Useful for performance-sensitive code running in browser or Node.

Quick Start

An cheap-eval expression is an array in the form of: [operator, ...operands]. The most basic operators are has and get:

const createEval = require("cheap-eval")
const person = { age: 20 }

const hasAge = createEval(["has", "age"])
hasAge(person) // Return true

const getAge = createEval(["get", "age"])
getAge(person) // Return 20

Expressions can be nested to form complex rules.

const person = { age: 20 }

const isWorkingAge = createEval([">=", 18, ["get", "age"], 65])
isWorkingAge(person) // Return true

const isDrinkingAge = createEval([">", ["get", "age"], 20])
isDrinkingAge(person) // Return false

Usage

Bind with filter, sort