How to use the isWeakMap function from lodash

Find comprehensive JavaScript lodash.isWeakMap code examples handpicked from public code repositorys.

lodash.isWeakMap is a function provided by Lodash that checks whether a given value is a WeakMap object.

lodash-contrib.commonjs.js

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module.exports.isString            = _.isString;
module.exports.isSymbol            = _.isSymbol;
module.exports.isTypedArray        = _.isTypedArray;
module.exports.isUndefined         = _.isUndefined;
module.exports.isValidDate         = _.isValidDate;
module.exports.isWeakMap           = _.isWeakMap;
module.exports.isWeakSet           = _.isWeakSet;
module.exports.isZero              = _.isZero;
module.exports.iterateUntil        = _.iterateUntil;
module.exports.iteratee            = _.iteratee;

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+ 92 other calls in file

lodash.js

GitHub: mdmarufsarker/lodash

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console.log(isTypedArray); // => true


const isUndefined = _.isUndefined(undefined);
console.log(isUndefined); // => true


const isWeakMap = _.isWeakMap(new WeakMap);
console.log(isWeakMap); // => true


const isWeakSet = _.isWeakSet(new WeakSet);
console.log(isWeakSet); // => true

+ 15 other calls in file

How does lodash.isWeakMap work?

lodash.isWeakMap works by examining a given value and determining whether it is a WeakMap object.

A WeakMap is a built-in object in JavaScript that represents a collection of key/value pairs. However, unlike a regular Map object, the keys of a WeakMap must be objects, and those objects are weakly held, meaning they can be garbage collected even if they are still referenced by the WeakMap.

To check whether a given value is a WeakMap object, lodash.isWeakMap performs several checks. First, it checks whether the value is an object, since only objects can be WeakMaps. It then checks whether the object has a constructor property that equals the WeakMap constructor function. Finally, it checks whether the object has a set method and a delete method, which are methods that are required for any WeakMap object.

If the value passes all of these checks, then lodash.isWeakMap returns true. Otherwise, it returns false.

By using lodash.isWeakMap, developers can programmatically determine whether a given value is a WeakMap object, allowing them to perform operations on WeakMaps with confidence.

Ai Example

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const _ = require("lodash");

const weakMap = new WeakMap();
const object = {};

console.log(_.isWeakMap(weakMap)); // true
console.log(_.isWeakMap(object)); // false

In this example, we first create a new WeakMap object called weakMap, which is a built-in object in JavaScript that represents a collection of key/value pairs where the keys are weakly held. We then create a plain object called object. We then use lodash.isWeakMap to check whether weakMap and object are WeakMap objects. As expected, _.isWeakMap(weakMap) returns true since weakMap is a WeakMap object, while _.isWeakMap(object) returns false since object is not a WeakMap object. By using lodash.isWeakMap, we can programmatically determine whether a given value is a WeakMap object, allowing us to perform operations on WeakMaps with confidence.

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