hasard/lib/hasard/function.js

Random variables and random nested objects manipulation in javascript

const AbstractHasard = require('./abstract');
const RandomArray = require('./array');

class FunctionHasard extends AbstractHasard {
	check(key, value) {
		if (key === 'fn') {
			if (typeof (value) !== 'function') {
				throw (new TypeError(`${key} ${value} must be a function`));
			}
		}

		if (key === 'args') {
			if (value && !Array.isArray(value)) {
				throw (new TypeError(`${key} ${value} must be an array`));
			}
		}
	}

	getOpts({args, fn}) {
		return {
			args,
			fn
		};
	}

	generate(ctx) {
		return ctx.fn(...ctx.args);
	}

	static build(hasardContext, fn) {
		return function (...args) {
			const f = new FunctionHasard({args: new RandomArray(args), fn});
			if (hasardContext && hasardContext.prng) {
				f._prng = hasardContext.prng;
			}

			return f;
		};
	}
}

module.exports = FunctionHasard;