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bin-test.js
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bin-test.js
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import assert from "assert";
import {csvParse} from "d3-dsv";
import {readFile} from "fs/promises";
import {bin, extent, histogram, thresholdSturges, ticks} from "../src/index.js";
it("histogram is a deprecated alias for bin", () => {
assert.strictEqual(histogram, bin);
});
it("bin() returns a default bin generator", () => {
const h = bin();
assert.strictEqual(h.value()(42), 42);
assert.strictEqual(h.domain(), extent);
assert.deepStrictEqual(h.thresholds(), thresholdSturges);
});
it("bin(data) computes bins of the specified array of data", () => {
const h = bin();
assert.deepStrictEqual(h([0, 0, 0, 10, 20, 20]), [
box([0, 0, 0], 0, 5),
box([], 5, 10),
box([10], 10, 15),
box([], 15, 20),
box([20, 20], 20, 25)
]);
});
it("bin(iterable) is equivalent to bin(array)", () => {
const h = bin();
assert.deepStrictEqual(h(iterable([0, 0, 0, 10, 20, 20])), [
box([0, 0, 0], 0, 5),
box([], 5, 10),
box([10], 10, 15),
box([], 15, 20),
box([20, 20], 20, 25)
]);
});
it("bin.value(number) sets the constant value", () => {
const h = bin().value(12); // Pointless, but for consistency.
assert.deepStrictEqual(h([0, 0, 0, 1, 2, 2]), [
box([0, 0, 0, 1, 2, 2], 12, 12),
]);
});
it("bin(data) does not bin null, undefined, or NaN", () => {
const h = bin();
assert.deepStrictEqual(h([0, null, undefined, NaN, 10, 20, 20]), [
box([0], 0, 5),
box([], 5, 10),
box([10], 10, 15),
box([], 15, 20),
box([20, 20], 20, 25)
]);
});
it("bin.value(function) sets the value accessor", () => {
const h = bin().value((d) => d.value);
const a = {value: 0};
const b = {value: 10};
const c = {value: 20};
assert.deepStrictEqual(h([a, a, a, b, c, c]), [
box([a, a, a], 0, 5),
box([], 5, 10),
box([b], 10, 15),
box([], 15, 20),
box([c, c], 20, 25)
]);
});
it("bin.domain(array) sets the domain", () => {
const h = bin().domain([0, 20]);
assert.deepStrictEqual(h.domain()(), [0, 20]);
assert.deepStrictEqual(h([1, 2, 2, 10, 18, 18]), [
box([1, 2, 2], 0, 5),
box([], 5, 10),
box([10], 10, 15),
box([18, 18], 15, 20)
]);
});
it("bin.domain(function) sets the domain accessor", () => {
let actual;
const values = [1, 2, 2, 10, 18, 18];
const domain = (values) => { actual = values; return [0, 20]; };
const h = bin().domain(domain);
assert.strictEqual(h.domain(), domain);
assert.deepStrictEqual(h(values), [
box([1, 2, 2], 0, 5),
box([], 5, 10),
box([10], 10, 15),
box([18, 18], 15, 20)
]);
assert.deepStrictEqual(actual, values);
});
it("bin.thresholds(number) sets the approximate number of bin thresholds", () => {
const h = bin().thresholds(3);
assert.deepStrictEqual(h([0, 0, 0, 10, 30, 30]), [
box([0, 0, 0], 0, 10),
box([10], 10, 20),
box([], 20, 30),
box([30, 30], 30, 40)
]);
});
it("bin.thresholds(array) sets the bin thresholds", () => {
const h = bin().thresholds([10, 20]);
assert.deepStrictEqual(h([0, 0, 0, 10, 30, 30]), [
box([0, 0, 0], 0, 10),
box([10], 10, 20),
box([30, 30], 20, 30)
]);
});
it("bin.thresholds(array) ignores thresholds outside the domain", () => {
const h = bin().thresholds([0, 1, 2, 3, 4]);
assert.deepStrictEqual(h([0, 1, 2, 3]), [
box([0], 0, 1),
box([1], 1, 2),
box([2], 2, 3),
box([3], 3, 3)
]);
});
it("bin.thresholds(function) sets the bin thresholds accessor", () => {
let actual;
const values = [0, 0, 0, 10, 30, 30];
const h = bin().thresholds((values, x0, x1) => { actual = [values, x0, x1]; return [10, 20]; });
assert.deepStrictEqual(h(values), [
box([0, 0, 0], 0, 10),
box([10], 10, 20),
box([30, 30], 20, 30)
]);
assert.deepStrictEqual(actual, [values, 0, 30]);
assert.deepStrictEqual(h.thresholds(() => 5)(values), [
box([0, 0, 0], 0, 5),
box([], 5, 10),
box([10], 10, 15),
box([], 15, 20),
box([], 20, 25),
box([], 25, 30),
box([30, 30], 30, 35)
]);
});
it("bin(data) uses nice thresholds", () => {
const h = bin().domain([0, 1]).thresholds(5);
assert.deepStrictEqual(h([]).map(b => [b.x0, b.x1]), [
[0.0, 0.2],
[0.2, 0.4],
[0.4, 0.6],
[0.6, 0.8],
[0.8, 1.0]
]);
});
it("bin()() returns bins whose rightmost bin is not too wide", () => {
const h = bin();
assert.deepStrictEqual(h([9.8, 10, 11, 12, 13, 13.2]), [
box([9.8], 9, 10),
box([10], 10, 11),
box([11], 11, 12),
box([12], 12, 13),
box([13, 13.2], 13, 14)
]);
});
it("bin(data) handles fractional step correctly", () => {
const h = bin().thresholds(10);
assert.deepStrictEqual(h([9.8, 10, 11, 12, 13, 13.2]), [
box([9.8], 9.5, 10),
box([10], 10, 10.5),
box([], 10.5, 11),
box([11], 11, 11.5),
box([], 11.5, 12),
box([12], 12, 12.5),
box([], 12.5, 13),
box([13, 13.2], 13, 13.5)
]);
});
it("bin(data) handles fractional step correctly with a custom, non-aligned domain", () => {
const h = bin().thresholds(10).domain([9.7, 13.3]);
assert.deepStrictEqual(h([9.8, 10, 11, 12, 13, 13.2]), [
box([9.8], 9.7, 10),
box([10], 10, 10.5),
box([], 10.5, 11),
box([11], 11, 11.5),
box([], 11.5, 12),
box([12], 12, 12.5),
box([], 12.5, 13),
box([13, 13.2], 13, 13.3)
]);
});
it("bin(data) handles fractional step correctly with a custom, aligned domain", () => {
const h = bin().thresholds(10).domain([9.5, 13.5]);
assert.deepStrictEqual(h([9.8, 10, 11, 12, 13, 13.2]), [
box([9.8], 9.5, 10),
box([10], 10, 10.5),
box([], 10.5, 11),
box([11], 11, 11.5),
box([], 11.5, 12),
box([12], 12, 12.5),
box([], 12.5, 13),
box([13, 13.2], 13, 13.5)
]);
});
it("bin(data) coerces values to numbers as expected", () => {
const h = bin().thresholds(10);
assert.deepStrictEqual(h(["1", "2", "3", "4", "5"]), [
box(["1"], 1, 1.5),
box([], 1.5, 2),
box(["2"], 2, 2.5),
box([], 2.5, 3),
box(["3"], 3, 3.5),
box([], 3.5, 4),
box(["4"], 4, 4.5),
box([], 4.5, 5),
box(["5"], 5, 5.5)
]);
});
it("bin(athletes) produces the expected result", async () => {
const height = csvParse(await readFile("./test/data/athletes.csv", "utf8")).filter(d => d.height).map(d => +d.height);
const bins = bin().thresholds(57)(height);
assert.deepStrictEqual(bins.map(b => b.length), [1, 0, 0, 0, 0, 0, 2, 1, 2, 1, 1, 4, 11, 7, 13, 39, 78, 93, 119, 193, 354, 393, 573, 483, 651, 834, 808, 763, 627, 648, 833, 672, 578, 498, 395, 425, 278, 235, 182, 128, 91, 69, 43, 29, 21, 23, 3, 3, 1, 1, 1]);
});
it("bin(data) assigns floating point values to the correct bins", () => {
for (const n of [1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000, 10000, 20000, 50000]) {
assert.ok(bin().thresholds(n)(ticks(1, 2, n)).every(d => d.length === 1));
}
});
function box(bin, x0, x1) {
bin.x0 = x0;
bin.x1 = x1;
return bin;
}
function* iterable(array) {
yield* array;
}