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nest-test.js
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var vows = require("vows"),
_ = require("../../"),
load = require("../load"),
assert = require("../assert");
var suite = vows.describe("d3.nest");
suite.addBatch({
"entries": {
topic: load("arrays/nest").expression("d3.nest"),
"returns an array of each distinct key in arbitrary order": function(nest) {
var keys = nest()
.key(function(d) { return d.foo; })
.entries([{foo: 1}, {foo: 1}, {foo: 2}])
.map(function(d) { return d.key; })
.sort(_.ascending);
assert.deepEqual(keys, ["1", "2"]);
},
"each entry is a key-values object, with values in input order": function(nest) {
var entries = nest()
.key(function(d) { return d.foo; })
.entries([{foo: 1, bar: 0}, {foo: 2}, {foo: 1, bar: 1}]);
assert.deepEqual(entries, [
{key: "1", values: [{foo: 1, bar: 0}, {foo: 1, bar: 1}]},
{key: "2", values: [{foo: 2}]}
]);
},
"keys can be sorted using an optional comparator": function(nest) {
var keys = nest()
.key(function(d) { return d.foo; }).sortKeys(_.descending)
.entries([{foo: 1}, {foo: 1}, {foo: 2}])
.map(function(d) { return d.key; });
assert.deepEqual(keys, ["2", "1"]);
},
"values can be sorted using an optional comparator": function(nest) {
var entries = nest()
.key(function(d) { return d.foo; })
.sortValues(function(a, b) { return a.bar - b.bar; })
.entries([{foo: 1, bar: 2}, {foo: 1, bar: 0}, {foo: 1, bar: 1}, {foo: 2}]);
assert.deepEqual(entries, [
{key: "1", values: [{foo: 1, bar: 0}, {foo: 1, bar: 1}, {foo: 1, bar: 2}]},
{key: "2", values: [{foo: 2}]}
]);
},
"values can be aggregated using an optional rollup": function(nest) {
var entries = nest()
.key(function(d) { return d.foo; })
.rollup(function(values) { return _.sum(values, function(d) { return d.bar; }); })
.entries([{foo: 1, bar: 2}, {foo: 1, bar: 0}, {foo: 1, bar: 1}, {foo: 2}]);
assert.deepEqual(entries, [
{key: "1", values: 3},
{key: "2", values: 0}
]);
},
"multiple key functions can be specified": function(nest) {
var entries = nest()
.key(function(d) { return d[0]; }).sortKeys(_.ascending)
.key(function(d) { return d[1]; }).sortKeys(_.ascending)
.entries([[0, 1], [0, 2], [1, 1], [1, 2], [0, 2]]);
assert.deepEqual(entries, [
{key: "0", values: [
{key: "1", values: [[0, 1]]},
{key: "2", values: [[0, 2], [0, 2]]}
]},
{key: "1", values: [
{key: "1", values: [[1, 1]]},
{key: "2", values: [[1, 2]]}
]}
]);
},
"the rollup function only applies to leaf values": function(nest) {
var entries = nest()
.key(function(d) { return d[0]; }).sortKeys(_.ascending)
.key(function(d) { return d[1]; }).sortKeys(_.ascending)
.rollup(function(values) { return values.length; })
.entries([[0, 1], [0, 2], [1, 1], [1, 2], [0, 2]]);
assert.deepEqual(entries, [
{key: "0", values: [
{key: "1", values: 1},
{key: "2", values: 2}
]},
{key: "1", values: [
{key: "1", values: 1},
{key: "2", values: 1}
]}
]);
},
"the value comparator only applies to leaf values": function(nest) {
var entries = nest()
.key(function(d) { return d[0]; }).sortKeys(_.ascending)
.key(function(d) { return d[1]; }).sortKeys(_.ascending)
.sortValues(function(a, b) { return a[2] - b[2]; })
.entries([[0, 1], [0, 2, 1], [1, 1], [1, 2], [0, 2, 0]]);
assert.deepEqual(entries, [
{key: "0", values: [
{key: "1", values: [[0, 1]]},
{key: "2", values: [[0, 2, 0], [0, 2, 1]]}
]},
{key: "1", values: [
{key: "1", values: [[1, 1]]},
{key: "2", values: [[1, 2]]}
]}
]);
},
"the key comparator only applies to the last-specified key": function(nest) {
var entries = nest()
.key(function(d) { return d[0]; }).sortKeys(_.ascending)
.key(function(d) { return d[1]; }).sortKeys(_.descending)
.entries([[0, 1], [0, 2], [1, 1], [1, 2], [0, 2]]);
assert.deepEqual(entries, [
{key: "0", values: [
{key: "2", values: [[0, 2], [0, 2]]},
{key: "1", values: [[0, 1]]}
]},
{key: "1", values: [
{key: "2", values: [[1, 2]]},
{key: "1", values: [[1, 1]]}
]}
]);
var entries = nest()
.key(function(d) { return d[0]; }).sortKeys(_.descending)
.key(function(d) { return d[1]; }).sortKeys(_.ascending)
.entries([[0, 1], [0, 2], [1, 1], [1, 2], [0, 2]]);
assert.deepEqual(entries, [
{key: "1", values: [
{key: "1", values: [[1, 1]]},
{key: "2", values: [[1, 2]]}
]},
{key: "0", values: [
{key: "1", values: [[0, 1]]},
{key: "2", values: [[0, 2], [0, 2]]}
]}
]);
},
"if no keys are specified, the input array is returned": function(nest) {
var array = [new Object()];
assert.strictEqual(nest().entries(array), array);
}
}
});
suite.addBatch({
"map": {
topic: load("arrays/nest").expression("d3.nest"),
"returns a map of each distinct key": function(nest) {
var map = nest()
.key(function(d) { return d.foo; })
.map([{foo: 1, bar: 0}, {foo: 2}, {foo: 1, bar: 1}]);
assert.deepEqual(map, {
"1": [{foo: 1, bar: 0}, {foo: 1, bar: 1}],
"2": [{foo: 2}]
});
},
"values can be sorted using an optional comparator": function(nest) {
var map = nest()
.key(function(d) { return d.foo; })
.sortValues(function(a, b) { return a.bar - b.bar; })
.map([{foo: 1, bar: 2}, {foo: 1, bar: 0}, {foo: 1, bar: 1}, {foo: 2}]);
assert.deepEqual(map, {
"1": [{foo: 1, bar: 0}, {foo: 1, bar: 1}, {foo: 1, bar: 2}],
"2": [{foo: 2}]
});
},
"values can be aggregated using an optional rollup": function(nest) {
var map = nest()
.key(function(d) { return d.foo; })
.rollup(function(values) { return _.sum(values, function(d) { return d.bar; }); })
.map([{foo: 1, bar: 2}, {foo: 1, bar: 0}, {foo: 1, bar: 1}, {foo: 2}]);
assert.deepEqual(map, {
"1": 3,
"2": 0
});
},
"multiple key functions can be specified": function(nest) {
var map = nest()
.key(function(d) { return d[0]; }).sortKeys(_.ascending)
.key(function(d) { return d[1]; }).sortKeys(_.ascending)
.map([[0, 1], [0, 2], [1, 1], [1, 2], [0, 2]]);
assert.deepEqual(map, {
"0": {
"1": [[0, 1]],
"2": [[0, 2], [0, 2]]
},
"1": {
"1": [[1, 1]],
"2": [[1, 2]]
}
});
},
"the rollup function only applies to leaf values": function(nest) {
var map = nest()
.key(function(d) { return d[0]; }).sortKeys(_.ascending)
.key(function(d) { return d[1]; }).sortKeys(_.ascending)
.rollup(function(values) { return values.length; })
.map([[0, 1], [0, 2], [1, 1], [1, 2], [0, 2]]);
assert.deepEqual(map, {
"0": {
"1": 1,
"2": 2
},
"1": {
"1": 1,
"2": 1
}
});
},
"the value comparator only applies to leaf values": function(nest) {
var map = nest()
.key(function(d) { return d[0]; }).sortKeys(_.ascending)
.key(function(d) { return d[1]; }).sortKeys(_.ascending)
.sortValues(function(a, b) { return a[2] - b[2]; })
.map([[0, 1], [0, 2, 1], [1, 1], [1, 2], [0, 2, 0]]);
assert.deepEqual(map, {
"0": {
"1": [[0, 1]],
"2": [[0, 2, 0], [0, 2, 1]]
},
"1": {
"1": [[1, 1]],
"2": [[1, 2]]
}
});
},
"if no keys are specified, the input array is returned": function(nest) {
var array = [new Object()];
assert.strictEqual(nest().map(array), array);
},
"handles keys that are built-in prototype properties": function(nest) {
var map = nest()
.key(String)
.map(["hasOwnProperty"]); // but note __proto__ wouldn’t work!
assert.deepEqual(map, {hasOwnProperty: ["hasOwnProperty"]});
},
"a custom map implementation can be specified": function(nest) {
var map = nest()
.key(String)
.map(["hasOwnProperty", "__proto__"], _.map);
assert.deepEqual(map.entries(), [
{key: "hasOwnProperty", value: ["hasOwnProperty"]},
{key: "__proto__", value: ["__proto__"]}
]);
},
"the custom map implementation works on multiple levels of nesting": function(nest) {
var map = nest()
.key(function(d) { return d.foo; })
.key(function(d) { return d.bar; })
.map([{foo: 42, bar: "red"}], _.map);
assert.deepEqual(map.keys(), ["42"]);
assert.deepEqual(map.get("42").keys(), ["red"]);
assert.deepEqual(map.get("42").values(), [[{foo: 42, bar: "red"}]]);
assert.deepEqual(map.get("42").entries(), [{key: "red", value: [{foo: 42, bar: "red"}]}]);
}
}
});
suite.export(module);