lexical-env

Installation

Install with npm:

$ npm install lexical-env

Then require:

var env = require('lexical-env');

API

env.create([parent])

Create a new environment, with optional parent.

env.find(env, key)

Search the parent chain of env and return the first environment in which key is defined. Throws an error if key does not exist in env or any of its parent environments.

env.def(env, key, value)

Introduces a binding of key to value in environment env. Throws an error if key is already defined in env.

env.get(env, key)

Finds key in env and returns the associated value. Throws an error if key does not exist in env or any of its parent environments.

env.set(env, key, value)

Finds key in env and sets the associated value to value. This operation differs from def in that it will update the closest environment (or parent environment) in which key is found, rather than introducing a new binding.