Simple Expression Language for JavaScript

Requirements:

• Nodejs 4+

Install

npm install seljs --save

Features

• No side effects
• Fast and simple: small memory footprint
• No dependencies
• Simplified property access
• Expression cache

Language features

• Arithmetic, relation, equality and boolean opeations
• Groups
• Context and property access
• Literals: Strings and integers
• String concatenation
• Keywords: true, false and null

Work in progress

• Unary: not, minus
• Functions
• Global functions
• Language and operators documentation
• Floats
• Array Literals
• Date literals
• Datetime literals

Examples

const seljs = require("seljs"),
    assert = require("assert"),
    ctx = {
        int: 123,
        str: "123",
        obj: {
            int: 321,
            str: "321",
            obj: {
                deep: 333
            }
        }
    };

//Number literals
assert.strictEqual(seljs("123"), 123);

//String literals
assert.strictEqual(seljs("'123'"), "123");

//Basic arithmetic
assert.strictEqual(seljs("1 + 3 * 2 / 4 - 1 * 2"), 1 + 3 * 2 / 4 - 1 * 2);

//String concatenation
assert.strictEqual(seljs("'123' + '123'"), "123123");

//Context and property access
assert.strictEqual(seljs("int + obj.int + obj.obj.deep", ctx), 123 + 321 + 333);

License

MIT