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test.html
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test.html
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<!doctype html>
<html>
<head>
<script>
window.Generator = window.oldGenerator = {};
</script>
<script src="lyfe.js"></script>
<script>
function test(name, testFunction) {
document.write("<div style='float:left; width: 50%;'>");
document.write(name + ": ");
var result, exception;
try {
result = testFunction();
} catch (e) {
exception = e;
}
if (result)
document.write("<b style='color:green'>passed</b>");
else if (exception)
document.write("<b style='color:red'>exception: " + exception.message + "</b>");
else
document.write("<b style='color:red'>failed</b>");
document.write("</div>");
}
function arrEqual (a1, a2) {
if (a1.length != a2.length)
return false;
for (var i = 0; i < a1.length; i++)
if (a1[i] !== a2[i])
return false;
return true;
}
</script>
</head>
<body>
<script>
var helloWorld = function () { alert("hello world"); };
var a = [13, null, helloWorld, -10.5, "lolcat"];
test("noConflict", function () {
var newGenerator = window.Generator;
if (newGenerator === oldGenerator)
return false;
var localGenerator = newGenerator.noConflict();
if (localGenerator !== newGenerator)
return false;
if (window.Generator !== oldGenerator)
return false;
window.Generator = newGenerator;
return true;
});
test("array constructor", function () {
var roundtrip = Generator(a).toArray();
return arrEqual(a, roundtrip);
});
test("function constructor", function () {
var g = Generator(function (Yield) {
Yield(13);
Yield(null);
Yield(helloWorld);
Yield(-10.5);
Yield("lolcat");
});
return arrEqual(a, g.toArray());
});
test("object constructor", function () {
var g = Generator({
a: 13,
nothing: null,
hello: helloWorld
});
var res = g.toArray();
if (res.length !== 3)
return false;
if (!arrEqual(res[0], ["a", 13]))
return false;
if (!arrEqual(res[1], ["nothing", null]))
return false;
if (!arrEqual(res[2], ["hello", helloWorld]))
return false;
return true;
});
test("filter", function () {
var nonNumbers = Generator(a).filter(function (val) { return typeof val !== "number" }).toArray();
return arrEqual(nonNumbers, [null, helloWorld, "lolcat"]);
});
test("take", function () {
return arrEqual(Generator(a).take(3).toArray(), a.slice(0, 3));
});
test("take zero", function () {
return arrEqual(Generator(a).take(0).toArray(), []);
});
test("skip", function () {
return arrEqual(Generator(a).skip(3).toArray(), a.slice(3));
});
test("skip zero", function () {
return arrEqual(Generator(a).skip(0).toArray(), a);
});
test("skip and take", function () {
return arrEqual(Generator(a).skip(2).take(2).toArray(), [helloWorld, -10.5]);
});
test("map", function () {
var types = Generator(a).map(function (val) { return typeof val; }).toArray();
return arrEqual(types, ["number", "object", "function", "number", "string"]);
});
test("zipWithArray, short array", function () {
var zipped = Generator(a).zipWithArray([2, 4, 3, 1], function (a, b) { return (typeof a).substr(0, b); }).toArray();
return arrEqual(zipped, ["nu", "obje", "fun", "n"]);
});
test("zipWithArray, long array", function () {
var zipped = Generator(a).zipWithArray([2, 4, 3, 1, 3, 4, 1, 9, 2], function (a, b) { return (typeof a).substr(0, b); }).toArray();
return arrEqual(zipped, ["nu", "obje", "fun", "n", "str"]);
});
test("changing source array in zipWithArray", function () {
var arr = [2, 4, 3, 1];
var zipGen = Generator(a).zipWithArray(arr, function (a, b) { return (typeof a).substr(0, b); });
var zipped1 = zipGen.toArray();
arr.push(1, 2);
arr.shift();
var zipped2 = zipGen.toArray();
return arrEqual(zipped2, ["numb", "obj", "f", "n", "st"]);
});
test("reduce", function () {
var sixFactorial = Generator([1, 2, 3, 4, 5, 6]).reduce(function (a, b) { return a * b; });
return sixFactorial === 720;
});
test("reduce with custom start value", function () {
var concatenated = Generator(["f", "ai", "l", "ed"]).reduce(function (a, b) { return a + b; }, "not ");
return concatenated === "not failed";
});
test("and", function () {
var b = [ "more", 2 / 7, { key: "value" } ];
return arrEqual(Generator(a).and(Generator(b)).toArray(), a.concat(b));
});
test("and with array", function () {
var b = [ "more", 2 / 7, { key: "value" } ];
return arrEqual(Generator(a).and(b).toArray(), a.concat(b));
});
test("takeWhile", function () {
var noFunctions = Generator(a).takeWhile(function (val) { return typeof val !== "function" }).toArray();
return arrEqual(noFunctions, [13, null]);
});
test("skipWhile", function () {
var startWithFalsy = Generator(a).skipWhile(function (val) { return val; }).toArray();
return arrEqual(startWithFalsy, a.slice(1));
});
test("all", function () {
var r1 = Generator(a).all();
var r2 = Generator(["yes", 1, {}]).all();
return !r1 && r2;
});
test("all short-circuits", function () {
var goodCount = 0;
var good = function () {
goodCount++;
return true;
};
var bad = function () {
return false;
}
var result = Generator([good, good, bad, good, bad]).map(function (f) { return f(); }).all();
return goodCount === 2 && !result;
});
test("any", function () {
var r1 = Generator(a).any();
var r2 = Generator(["", null, 0]).any();
return r1 && !r2;
});
test("any short-circuits", function () {
var goodCount = 0;
var good = function () {
goodCount++;
return true;
};
var bad = function () {
return false;
}
var result = Generator([bad, bad, good, good, bad, good, bad]).map(function (f) { return f(); }).any();
return goodCount === 1 && result;
});
test("all and any with nothing", function () {
var nothing = Generator([]);
return nothing.all() && !nothing.any();
});
test("first", function () {
var g = Generator(a);
return (g.skip(2).first() === helloWorld) && (typeof g.skip(20).first() === "undefined");
});
test("groupBy", function () {
var grouped = Generator(a).groupBy(function (v) { return (typeof v).substr(1,1) });
var expected_groups = ["u", "b", "t"];
var expected_contents = {
u: [13, helloWorld, -10.5],
b: [null],
t: ["lolcat"]
};
good = true;
grouped.forEach(function (val) {
var g = expected_groups.shift();
if (val.key !== g) {
good = false;
return;
}
if (!arrEqual(val.toArray(), expected_contents[g]))
good = false;
});
return good;
});
test("send to Yield", function () {
var gen = Generator(function (Yield) {
Yield("first");
var other = Yield("second");
Yield(other);
Yield("end");
});
var arr = [];
gen.forEach(function (val) {
arr.push(val);
return "third";
});
return arrEqual(arr, ["first", "second", "third", "end"]);
});
test("stop", function () {
var good = true;
var gen = Generator(function (Yield) {
Yield(42);
Yield(1337);
Yield(-5);
good = false;
Yield(100);
});
var lastValue;
gen.forEach(function (val, index, stop) {
lastValue = val;
if (val < 0)
stop();
});
return good && lastValue === -5;
});
test("cleanup when stopping outer", function () {
var innerClean = false,
outerClean = false;
var inner = Generator(function (Yield, yieldMany) {
try {
yieldMany(Generator([1, 2, 3, 4]));
} finally {
innerClean = true;
}
});
var outer = Generator(function (Yield, yieldMany, stop) {
try {
inner.forEach(function (val, index) {
Yield(val);
if (val > 1)
stop();
});
} finally {
outerClean = true;
}
});
var result = outer.toArray();
return arrEqual(result, [1, 2]) && innerClean && outerClean;
});
test("cleanup when stopping inner", function () {
var innerClean = false,
outerClean = false;
var inner = Generator(function (Yield, yieldMany) {
try {
yieldMany(Generator([1, 2, 3, 4]));
} finally {
innerClean = true;
}
});
var outer = Generator(function (Yield) {
try {
inner.forEach(function (val, index, stop) {
Yield(val);
if (val > 1)
stop();
});
} finally {
outerClean = true;
}
});
var result = outer.toArray();
return arrEqual(result, [1, 2]) && innerClean && outerClean;
});
test("yieldMany", function () {
var nested = [ [1, 7], 9, [3, [1, 8], 5], [2, [2, 3, 4]]];
var flatten = function (element) {
if (typeof element === "number")
return Generator([element]);
return Generator(function (Yield, yieldMany) {
Generator(element).forEach(function (val) {
yieldMany(flatten(val));
});
});
};
return arrEqual(flatten(nested).toArray(), [1, 7, 9, 3, 1, 8, 5, 2, 2, 3, 4]);
});
test("yieldMany with array", function () {
var nested = [ [1, 7], 9, [3, [1, 8], 5], [2, [2, 3, 4]]];
var flatten = function (element) {
if (typeof element === "number")
return [element];
return Generator(function (Yield, yieldMany) {
Generator(element).forEach(function (val) {
yieldMany(flatten(val));
});
}).toArray();
};
return arrEqual(flatten(nested), [1, 7, 9, 3, 1, 8, 5, 2, 2, 3, 4]);
});
test("changing source array", function () {
var arr = ["x", 42, null];
var gen = Generator(arr);
arr.push(helloWorld);
return arrEqual(gen.toArray(), arr);
});
test("evaluated", function () {
var called = 0;
var square = function (x) { called++; return x * x; };
var numbers = Generator([1, 3, 5]);
var squares = numbers.map(square).evaluated();
var doubled = squares.and(squares).toArray()
return arrEqual(doubled, [1, 9, 25, 1, 9, 25]) && called == 3;
});
test("thisObj argument to filter", function () {
var good1, good2;
var obj = { foo: 123 };
var gen = Generator([42]);
gen.filter(function (x) { good1 = this === window; return true; }).toArray();
gen.filter(function (x) { good2 = this === obj; return true; }, obj).toArray();
return good1 && good2;
});
test("thisObj argument to map", function () {
var good1, good2;
var obj = { foo: 123 };
var gen = Generator([42]);
gen.map(function (x) { good1 = this === window; return 43; }).toArray();
gen.map(function (x) { good2 = this === obj; return 43; }, obj).toArray();
return good1 && good2;
});
test("thisObj argument to forEach", function () {
var good1, good2;
var obj = { foo: 123 };
var gen = Generator([42]);
gen.forEach(function (x) { good1 = this === window; });
gen.forEach(function (x) { good2 = this === obj; }, obj);
return good1 && good2;
});
test("array constructor doesn't yield unset/deleted elements", function () {
var arr = [2, undefined, "bla", helloWorld, false];
arr[12] = "late";
delete arr[3];
return arrEqual(Generator(arr).toArray(), [2, undefined, "bla", false, "late"]);
});
test("groupBy only starts on iteration", function () {
var called = false;
var grouper = function (x) { called = true; return typeof x; }
var g = Generator(a).groupBy(grouper);
if (called)
return false;
g.evaluated();
return called;
});
test("groupBy re-groups everytime", function () {
var arr = [1, 2, -1];
var g = Generator(arr).groupBy(function (v) { return v > 0; });
var first = g.map(function (x) { return x.toArray(); }).toArray();
arr[1] = -2;
var second = g.map(function (x) { return x.toArray(); }).toArray();
var good = first.length === 2 && second.length === 2;
good = good && arrEqual(first[0], [1, 2]) && arrEqual(first[1], [-1]);
good = good && arrEqual(second[0], [1]) && arrEqual(second[1], [-2, -1]);
return good;
});
test("late yield throws exception", function () {
var leaked, good = false, seen = [];
var g = Generator(function (Yield) {
leaked = Yield;
Yield(1);
Yield("forty-two");
});
g.forEach(function (val) { seen.push(val); });
if (!(typeof leaked === "function"))
return false;
try {
leaked("boo");
} catch (e) {
if (e instanceof Generator.IterationError && e.message === "yield after end of iteration")
good = true;
else
throw e;
}
return good && arrEqual(seen, [1, "forty-two"]);
});
test("yield after stop throws exception", function () {
var leaked, good = false, seen = [];
var g = Generator(function (Yield) {
leaked = Yield;
Yield(1);
Yield("forty-two");
Yield(3);
});
g.forEach(function (val, index, stop) { seen.push(val); if (typeof val === "string") stop(); });
if (!(typeof leaked === "function"))
return false;
try {
leaked("boo");
} catch (e) {
if (e instanceof Generator.IterationError && e.message === "yield after end of iteration")
good = true;
else
throw e;
}
return good && arrEqual(seen, [1, "forty-two"]);
});
test("yield after exception throws exception", function () {
var leaked, good = false, seen = [];
var g = Generator(function (Yield) {
leaked = Yield;
Yield(1);
Yield("forty-two");
Yield(3);
});
try {
g.forEach(function (val) { seen.push(val); if (typeof val === "string") null(); });
} catch (e) {
if (!e instanceof TypeError)
throw e;
}
if (!(typeof leaked === "function"))
return false;
try {
leaked("boo");
} catch (e) {
if (e instanceof Generator.IterationError && e.message === "yield after end of iteration")
good = true;
else
throw e;
}
return good && arrEqual(seen, [1, "forty-two"]);
});
test("except", function() {
var good = arrEqual(Generator(a).except(helloWorld).toArray(), [13, null, -10.5, "lolcat"]);
good = good && arrEqual(Generator([1, 3, 3, 7]).except(3).toArray(), [1, 7]);
return good;
});
test("sortBy", function () {
return arrEqual(Generator(a).sortBy(function (x) { return typeof x; }).toArray(), [helloWorld, 13, -10.5, null, "lolcat"]);
});
test("sortBy is (probably) stable", function () {
var realSort = Array.prototype.sort;
Array.prototype.sort = function (f) { this.reverse(); realSort.call(this, f); };
var good = arrEqual(Generator(a).sortBy(function (x) { return typeof x; }).toArray(), [helloWorld, 13, -10.5, null, "lolcat"]);
Array.prototype.sort = realSort;
return good;
});
test("sortBy is cranky", function () {
var good = false;
try {
Generator(a).sortBy(function (x) { return NaN; }).toArray();
} catch (e) {
good = e instanceof TypeError && /^cannot compare/.test(e.message);
}
try {
var v = true;
Generator(a).sortBy(function (x) { v = !v; return v ? "0" : 0; }).toArray();
} catch (e) {
good = good && e instanceof TypeError && /^cannot compare/.test(e.message);
}
return good;
});
test("sortBy calls keyFunc exactly once per element", function () {
var n = 0;
Generator(a).sortBy(function (x) { n++; return typeof x; }).toArray();
return n === a.length;
});
test("any with predicate", function () {
var good = Generator(a).any(function (x) { return typeof x === "function" });
good = good && !Generator([-3, -7, 0]).any(function (x) { return x > 0; });
return good;
});
test("all with predicate", function () {
var good = !Generator(a).all(function (x) { return typeof x === "function" });
good = good && Generator([-3, -7, 0]).all(function (x) { return x <= 0; });
return good;
});
test("count", function () {
var good = Generator(a).count() === 5 && Generator([]).count() === 0;
var withHole = [1,2,3,,4];
return good && Generator(withHole).count() === 4;
});
var o0 = {foo: 12, bar: "hello"},
o1 = {foo: -3, bar: false},
o2 = {foo: 0, bar: null},
o3 = {foo: 42, bar: "hello"},
o4 = {foo: -1},
objects = Generator([o0, o1, o2, o3, o4]);
function testSelector(method, expectFoo, expectBar) {
test(method + " with string", function () {
return arrEqual(objects[method]("foo").toArray(), expectFoo) && arrEqual(objects[method]("bar").toArray(), expectBar);
});
}
testSelector("filter", [o0, o1, o3, o4], [o0, o3]);
testSelector("map", [12, -3, 0, 42, -1], ["hello", false, null, "hello", undefined]);
testSelector("takeWhile", [o0, o1], [o0]);
testSelector("skipWhile", [o2, o3, o4], [o1, o2, o3, o4]);
test("all with string", function () {
var good = !objects.all("foo");
good = good && Generator([]).all("foo");
good = good && objects.except(o2).all("foo");
good = good && !objects.all("bar");
good = good && Generator([o0, o3]).all("bar");
good = good && !Generator([o0, o3, o4]).all("bar");
return good;
});
test("any with string", function () {
var good = objects.any("foo");
good = good && !Generator([]).any("foo");
good = good && objects.any("bar");
good = good && !Generator([o1, o2, o4]).any("bar");
good = good && objects.except(o0).any("bar");
return good;
});
test("groupBy with string", function () {
var grouped = objects.groupBy("bar");
var expected_groups = ["hello", false, null, undefined];
var expected_contents = [
[o0, o3],
[o1],
[o2],
[o4]
]
var good = true;
grouped.forEach(function (val) {
var g = expected_groups.shift(),
e = expected_contents.shift();
if (val.key !== g) {
good = false;
return;
}
if (!arrEqual(val.toArray(), e))
good = false;
});
return good;
});
test("sortBy with string", function () {
return arrEqual(objects.sortBy("foo").toArray(), [o1, o4, o2, o0, o3])
});
test("zipWithArray behaves consistently with arrays with holes", function () {
var a = [13,,7];
var b = [4,9,,];
var r1 = Generator(a).zipWithArray(b, function (x, y) { return x + y }).toArray();
var r2 = Generator(b).zipWithArray(a, function (x, y) { return x + y }).toArray();
return arrEqual(r1, r2);
});
</script>
</body>
</html>