Histogram

Sorts raw numbers into bins, to show how they are spread.

SourcePackage @kerf-js/veneer

Preview

tsx

import { Histogram } from '@kerf-js/veneer'export function Latency() {  return (  <Histogram    title="Storefront latency"    description="240 requests, last hour"    data={LATENCIES}    binWidth={20}    format={ms}    name="Requests"  />  )}const wobble = (i: number) =>  (Math.sin(i * 12.9898) * 43758.5453) % 1const LATENCIES = Array.from(  { length: 240 },  (_, i) =>    Math.round(      62 +        Math.abs(wobble(i)) * 70 +        Math.abs(wobble(i + 300)) * 50 +        (i % 37 === 0 ? 160 : 0),    ),)const ms = (v: number) => `${Math.round(v)} ms`

Installation

npm install @kerf-js/veneer

Usage

tsx

import { Histogram } from '@kerf-js/veneer'<Histogram  title="Storefront latency"  description="240 requests, last hour"  data={LATENCIES}  binWidth={20}  format={ms}  name="Requests"/>

Accessibility

Every chart has a text alternative and a table view of its numbers, so nothing depends on seeing the marks. See Chart for its keyboard support.

API Reference

Prop	Type	Default	Description
`title`	`string`	—	The heading.
`level`	`2 \| 3 \| 4 \| 6 \| 5`	—	The title's heading level: one below the heading the chart sits under. Default 3, a chart in a page section.
`description`	`unknown`	—	One supporting line under the title.
`toolbar`	`unknown`	—	Beside the view toggle: a layout switch, a range picker.
`state`	`"error" \| "loading" \| "empty"`	—	Replaces the plot, in the same frame. With no data the frame shows `empty` on its own.
`loading`	`string`	—	Shows that work is under way.
`empty`	`{ title: string; detail?: unknown; }`	—	The title and detail shown in place of the plot when there is no data.
`error`	`{ title: string; detail?: unknown; }`	—	A message that marks the field invalid and says why.
`action`	`unknown`	—	The next step under an empty or error state: a Retry button.
`data`	`number[]`	—	The series to draw.
`summary`	`string \| ((c: { data: number[]; title: string; }) => string)`	—	One sentence for screen readers and the page; generated from the data when absent.
`binWidth`	`number`	—	The width of each bin, in the data's units.
`format`	`Fmt`	—	Turns a value into the text shown.
`name`	`string`	—	What is being counted.

RelatedBox plot