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The lazy-val npm package provides a way to lazily evaluate values. This means that the value is only computed when it is needed, which can help improve performance and reduce unnecessary computations.
Lazy Value Initialization
This feature allows you to define a value that is only computed when it is first accessed. Subsequent accesses to the value will return the cached result without recomputing it.
const { Lazy } = require('lazy-val');
const lazyValue = new Lazy(() => {
console.log('Computing the value...');
return 42;
});
console.log('Before accessing the value');
console.log(lazyValue.value); // Logs 'Computing the value...' and then '42'
console.log('After accessing the value');
console.log(lazyValue.value); // Logs '42' without recomputing
Resetting the Lazy Value
This feature allows you to reset the lazy value, forcing it to recompute the next time it is accessed.
const { Lazy } = require('lazy-val');
const lazyValue = new Lazy(() => {
console.log('Computing the value...');
return Math.random();
});
console.log(lazyValue.value); // Computes and logs the value
lazyValue.reset();
console.log(lazyValue.value); // Recomputes and logs the new value
lazy.js is a utility library that provides lazy evaluation for JavaScript. It offers a wide range of functionalities for working with collections and sequences in a lazy manner. Compared to lazy-val, lazy.js is more feature-rich and provides more utilities for working with data.
lodash is a popular utility library that provides a wide range of functions for working with arrays, objects, and other data types. It includes a `_.memoize` function that can be used to achieve similar lazy evaluation for functions. While lodash is more general-purpose, lazy-val is more focused on lazy value initialization.
memoizee is a library specifically designed for memoization, which is a form of lazy evaluation where the result of a function call is cached based on its arguments. It provides more advanced memoization features compared to lazy-val, such as cache expiration and custom cache resolvers.
Lazy value.
class Lazy<T> {
constructor(creator: () => Promise<T>)
readonly hasValue: boolean
value: Promise<T>
}
FAQs
Lazy value.
The npm package lazy-val receives a total of 280,993 weekly downloads. As such, lazy-val popularity was classified as popular.
We found that lazy-val 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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