define-lazy-prop
Advanced tools
Package description
The define-lazy-prop npm package allows developers to define properties on an object that are lazily evaluated. This means the value of these properties is only computed when they are accessed for the first time. This can be particularly useful for improving performance by delaying expensive computations or for initializing properties that depend on external resources that might not be immediately available.
Lazy property definition
This feature allows you to define a property on an object that will only compute its value the first time it is accessed. The example demonstrates defining a lazy property 'expensiveValue' on an object, where the value is only computed upon first access.
const defineLazyProp = require('define-lazy-prop');
const obj = {};
defineLazyProp(obj, 'expensiveValue', () => {
// Imagine an expensive operation here
return 'value computed';
});
console.log(obj.expensiveValue); // The function is called and value computed nowSimilar to define-lazy-prop, lazy-value allows for the definition of lazy-evaluated values. However, lazy-value is specifically designed for lazy initialization of a single value rather than attaching properties to objects. It's a more focused tool for cases where you only need to lazily initialize a value without attaching it to an object.
proxy-lazy is another package that offers lazy evaluation capabilities, but it does so using JavaScript's Proxy object. This allows for lazy properties to be defined on objects in a way that is transparent to the user of the object. It's a more powerful and flexible approach but requires familiarity with JavaScript's Proxy API.
Readme
Define a lazily evaluated 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.
$ npm install define-lazy-prop
import defineLazyProperty from 'define-lazy-prop';
const unicorn = {
// …
};
defineLazyProperty(unicorn, 'rainbow', () => expensiveComputation());
app.on('user-action', () => {
doSomething(unicorn.rainbow);
});
Type: object
Object to add the property to.
Type: string
Name of the property to add.
Type: Function
Called the first time propertyName is accessed. Expected to return a value.
FAQs
Define a lazily evaluated property on an object
The npm package define-lazy-prop receives a total of 20,688,006 weekly downloads. As such, define-lazy-prop popularity was classified as popular.
We found that define-lazy-prop demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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