[Ramda] Filter an Array Based on Multiple Predicates with Ramda's allPass Function
In this lesson, we'll filter a list of objects based on multiple conditions and we'll use Ramda's allPass
function to create a joint predicate from multiple, individual predicate functions.
const R = require('ramda'); const { allPass, propEq, lte, propSatisfies, filter } = R; const cars = [
{
name: 'suv',
doors: 4,
mpg: 19
},
{
name: 'sedan',
doors: 4,
mpg: 30
},
{
name: 'hybrid',
doors: 4,
mpg: 37
},
{
name: 'compact',
doors: 2,
mpg: 32
}
]; const mpgLte30 = propSatisfies(lte(R.__, 30), 'mpg');
const fourDoors = propEq('doors', 4);
const preds = allPass([
mpgLte30,
fourDoors
]);
const result = filter(preds)(cars);
console.log(result);
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