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