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var assert = require('assert');
var Lazy = require('..');
var expresso = expresso;
function range(i, j) {
var r = [];
for (;i<j;i++) r.push(i);
return r;
}
exports['complex'] = function () {
var lazy = new Lazy;
var data1 = [];
var data2 = [];
var data3 = [];
var joinExecuted = false;
lazy
.map(function (x) {
return 2*x;
})
.forEach(function (x) {
data1.push(x);
})
.map(function (x) {
return x/2;
})
.take(5)
.forEach(function (x) {
data2.push(x);
})
.filter(function (x) {
return x % 2 == 0;
})
.forEach(function (x) {
data3.push(x);
})
.join(function (xs) {
joinExecuted = true;
assert.deepEqual(xs, [0, 2, 4]);
});
range(0,10).forEach(function (x) {
lazy.emit('data', x);
});
lazy.emit('end');
assert.deepEqual(data1, range(0,10).map(function (x) { return x*2 }));
assert.deepEqual(data2, range(0,5));
assert.deepEqual(data3, [0, 2, 4]);
assert.ok(joinExecuted);
}