What is d3-array?
The d3-array package is a JavaScript library that provides powerful data manipulation and analysis functions. It is part of the D3 (Data-Driven Documents) suite of tools, which are used for handling and visualizing data on the web. d3-array includes methods for statistics, searching, sorting, transforming, and more.
What are d3-array's main functionalities?
Statistics
Calculate statistical measures such as mean, median, min, max, sum, variance, and standard deviation.
const d3 = require('d3-array');
const data = [1, 2, 3, 4, 5];
const mean = d3.mean(data);
Searching
Search for a value in a sorted array using binary search, such as bisectLeft and bisectRight.
const d3 = require('d3-array');
const data = [1, 2, 3, 4, 5];
const index = d3.bisectLeft(data, 3);
Sorting
Sort data using natural or custom comparators.
const d3 = require('d3-array');
const data = [{name: 'Alice', age: 40}, {name: 'Bob', age: 30}];
const sortedData = data.sort(d3.comparator((a, b) => a.age - b.age));
Transforming
Transform data using methods like rollup and group to aggregate and organize data.
const d3 = require('d3-array');
const data = [1, 2, 3, 4, 5];
const rolledUp = d3.rollup(data, v => v.length, d => d);
Histogram
Generate histograms to bin data into discrete intervals.
const d3 = require('d3-array');
const data = [1, 2, 3, 4, 5];
const histogram = d3.histogram().thresholds(5)(data);
Other packages similar to d3-array
lodash
Lodash is a general utility library that offers similar array manipulation methods, such as sorting, searching, and transforming collections. It is broader in scope but does not focus on statistical functions as much as d3-array.
underscore
Underscore.js is another utility library with functions for working with arrays, objects, and functions. It is similar to lodash and provides many of the same features, but it is not as modular as d3-array.
simple-statistics
Simple-statistics is focused on statistical methods and provides a range of functions for statistical analysis. It is similar to the statistical aspects of d3-array but does not include data transformation and manipulation features.
crossfilter
Crossfilter is a library for exploring large multivariate datasets in the browser. It can perform similar data manipulation tasks but is optimized for coordinated views and fast filtering and grouping of data.