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+# define-lazy-prop [![Build Status](https://travis-ci.org/sindresorhus/define-lazy-prop.svg?branch=master)](https://travis-ci.org/sindresorhus/define-lazy-prop)
+
+> Define a [lazily evaluated](https://en.wikipedia.org/wiki/Lazy_evaluation) property on an object
+
+Useful when the value of a property is expensive to generate, so you want to delay the computation until the property is needed. For example, improving startup performance by deferring nonessential operations.
+
+
+## Install
+
+```
+$ npm install define-lazy-prop
+```
+
+
+## Usage
+
+```js
+const defineLazyProp = require('define-lazy-prop');
+
+const unicorn = {
+	// …
+};
+
+defineLazyProp(unicorn, 'rainbow', () => expensiveComputation());
+
+app.on('user-action', () => {
+	doSomething(unicorn.rainbow);
+});
+```
+
+
+## API
+
+### defineLazyProp(object, propertyName, fn)
+
+#### object
+
+Type: `Object`
+
+Object to add property to.
+
+#### propertyName
+
+Type: `string`
+
+Name of the property to add.
+
+#### fn
+
+Type: `Function`
+
+Called the first time `propertyName` is accessed. Expected to return a value.
+
+
+## Related
+
+- [lazy-value](https://github.com/sindresorhus/lazy-value) - Create a lazily evaluated value
+- [import-lazy](https://github.com/sindresorhus/import-lazy) - Import a module lazily
+- [p-lazy](https://github.com/sindresorhus/p-lazy) - Create a lazy promise
+
+
+## License
+
+MIT © [Sindre Sorhus](https://sindresorhus.com)