isWeakSet

isWeakSet :: a → Boolean

Evaluates whether the given value is of type WeakSet​
import isWeakSet from 'deep-waters/isWeakSet';
​
const wSet = new WeakSet();
​
wSet.add({ prop: 1 });
​
isWeakSet(map); // → true
isWeakSet(new Set()); // → false
isWeakSet, like any other type validator, is mostly used in composed validators:
import isString from 'deep-waters/isString';
import matchesPattern from 'deep-waters/matchesPattern';
​
const isEmail = compose(
  isString,
  matchesPattern(/^\w+([.-]?\w+)*@\w+([.-]?\w+)*(\.\w{2,3})+$/),
);
isWeakSet is built on top of ofClass validator and rely on Object.prototype.toString to check on the received value type in order to avoid typeof weird behaviours and encouraging a runtime strict type validation.

Type validators - Previous

isWeakMap

Last modified 3yr ago