it ('should drop the put if transducer filters it out', (cb) => {
var ch = chan(null, t.filter((n) => n > 1))
take(ch)
.then((val) => assert(val === 2))
.then(cb)
put(ch, 1) // dropped
put(ch, 2)
})
it('should allow filtering', function() {
var a = [1, 2, 3];
var s = transduce(t.filter(even), fromArray(a));
return reduce(function(results, x) {
return results.concat(x);
}, [], s)
.then(function(results) {
expect(results).toEqual(a.filter(even));
});
});
.range(1, 1000000)
.selectMany(function(x) {
return randObs()
})
function toPercent(x) {
return Math.floor(x * 100);
}
function isEven(x) {
return x % 2 === 0;
}
function sum(x, y) {
return x + y
}
let transducer = t.comp(t.map(toPercent), t.filter(isEven));
// Native higher-order function
console.time("native higher-order function");
source
.map(toPercent)
.filter(isEven)
.reduce(sum)
console.timeEnd("native higher-order function");
// Transducers
console.time("transducers");
t.transduce(transducer, sum, 0, source);