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d3-format

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d3-format

Format numbers for human consumption.

  • 3.1.0
  • unpublished
  • latest
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  • npm
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6.9M
decreased by-11.87%
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2
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What is d3-format?

The d3-format package is part of the D3 (Data-Driven Documents) JavaScript library, which is used for producing graphical visualizations of data primarily on the web. The d3-format module provides a system for formatting numbers for human-readable display, allowing users to specify the appearance of numbers, such as the decimal precision, alignment, padding, rounding, and locale-specific formatting.

What are d3-format's main functionalities?

Number Formatting

This feature allows you to format numbers using a variety of options. The example shows formatting a number to two decimal places.

const d3 = require('d3-format');
const format = d3.format('.2f');
console.log(format(3.14159)); // Outputs: '3.14'

Locale-specific Formatting

This feature supports locale-specific formatting. The example demonstrates formatting a number as currency in a European style, using comma for decimal and period for thousands separator.

const d3 = require('d3-format');
const locale = d3.formatLocale({ decimal: ',', thousands: '.', grouping: [3], currency: ['€', ''] });
const format = locale.format('$,.2f');
console.log(format(1234567.89)); // Outputs: '€1.234.567,89'

SI Prefix Formatting

This feature allows formatting numbers with SI prefixes, useful for representing large or small numbers succinctly. The example formats the number 1500 with an SI prefix, resulting in '1.50k'.

const d3 = require('d3-format');
const format = d3.format('.3s');
console.log(format(1500)); // Outputs: '1.50k'

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Package last updated on 04 Dec 2021

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