mapOf

Usage: mapOf(kpred, vpred, opts)

Returns a spec for a map whose keys satisfy kpred and vals satisfy vpred.

Source

Example:

const s = require('speculaas');
const {isInteger, isString} = s.utils;

s.def('::scores', s.mapOf(isString, isInteger));

s.isValid('::scores', {'Sally': 1000, 'Joe': 500});
// true

s.isValid('::scores', {'Sally': 1000, 'Joe': '500'});
// false