API Reference

128 API references across 81 languages — detailed method signatures, parameters, return values, and code examples for Python, JavaScript, Go, Rust and more.

Python

4 modules

String

Python String

Python str methods for manipulating text — splitting, replacing, searching, formatting and transforming strings.

1 class

List

Python List

Python list methods — mutable ordered sequences for storing and manipulating collections.

1 class

Dict

Python Dict

Python dict methods — mutable mapping of hashable keys to values.

1 class

Math

Python Math

Python built-in numeric functions — abs, round, min, max, sum, pow, divmod and conversions.

1 class

JavaScript

6 modules

Array

JavaScript Array

JavaScript Array methods for transforming, searching and mutating arrays.

1 class

String

JavaScript String

JavaScript String methods for splitting, replacing, matching and transforming text.

1 class

Math

JavaScript Math

JavaScript Math object — constants and functions for numbers.

1 class

Object

JavaScript Object

JavaScript Object static methods for keys, values, merging and freezing.

1 class

Date

JavaScript Date

JavaScript Date methods for reading and formatting dates and times.

1 class

Promise

JavaScript Promise

JavaScript Promise methods for asynchronous programming — combining, racing, resolving, and handling async values.

1 class

TypeScript

3 modules

Utility Types

TypeScript Utility Types

TypeScript built-in utility types for transforming and combining types.

1 class

Type Guards

TypeScript Type Guards

TypeScript type guards for narrowing types at runtime.

1 class

Decorators

TypeScript Decorators

TypeScript decorators — special declarations for annotating classes and their members (experimental).

1 class

Go

4 modules

strings

Go strings

Go strings package — functions for manipulating UTF-8 strings.

1 class

fmt

Go fmt

Go fmt package — formatted I/O with C-style verbs.

1 class

strconv

Go strconv

Go strconv package — conversions between strings and basic types.

1 class

sort

Go sort

Go sort package — sorting slices and custom collections.

1 class

Java

4 modules

String

Java String

Java String methods — immutable character sequences.

1 class

ArrayList

Java ArrayList

Java ArrayList — resizable-array implementation of the List interface.

1 class

HashMap

Java HashMap

Java HashMap — hash-table-based implementation of the Map interface.

1 class

Math

Java Math

Java Math class — methods for basic numeric operations.

1 class

SQL

4 modules

String Functions

SQL String Functions

SQL string functions for concatenation, extraction and transformation.

1 class

Aggregate Functions

SQL Aggregate Functions

SQL aggregate functions for summarizing grouped rows.

1 class

Date Functions

SQL Date Functions

SQL date and time functions for current values, arithmetic and formatting.

1 class

Window Functions

SQL Window Functions

SQL window functions for computations across rows related to the current row.

1 class

Rust

3 modules

std::vec::Vec

Rust std::vec::Vec

Rust's Vec<T> — a growable, heap-allocated contiguous sequence. The default collection for owned lists.

1 class

std::string::String

Rust std::string::String

Rust's String — a growable, owned UTF-8 encoded string type, heap-allocated and mutable.

1 class

std::collections::HashMap

Rust std::collections::HashMap

Rust's HashMap<K, V> — a hash map with quadratic probing and SipHash by default.

1 class

C++

3 modules

C++ <string>

C++ std::string — a contiguous, growable sequence of chars with a rich member-function interface.

1 class

C++ <vector>

C++ std::vector — a contiguous, dynamically-resizable array with O(1) random access.

1 class

<map>

C++ <map>

C++ std::map — an ordered associative container of key-value pairs, implemented as a red-black tree.

1 class

C#

3 modules

System.String

C# System.String

C# String — an immutable sequence of UTF-16 code units, the primary text type in .NET.

1 class

System.Collections.Generic.List<T>

C# System.Collections.Generic.List<T>

C# List<T> — a strongly-typed, dynamically-resizable list backed by an internal array.

1 class

System.Linq

C# System.Linq

C# LINQ — a set of extension methods for querying IEnumerable<T> sequences with a declarative syntax.

1 class

PHP

3 modules

string functions

PHP string functions

PHP's built-in string functions for measuring, searching, slicing, replacing and transforming strings.

1 class

array functions

PHP array functions

PHP's built-in array functions — PHP arrays serve as both lists and ordered maps.

1 class

PDO

PHP PDO

PHP Data Objects (PDO) — a uniform, object-oriented interface for accessing databases in PHP.

1 class

Ruby

3 modules

String

Ruby String

Ruby's String — a mutable sequence of bytes holding characters, with a rich set of methods.

1 class

Array

Ruby Array

Ruby's Array — an ordered, integer-indexed collection of any objects, with rich functional methods.

1 class

Hash

Ruby Hash

Ruby's Hash — a dictionary mapping unique keys to values, preserving insertion order.

1 class

Swift

3 modules

String

Swift String

Swift's String — a value type representing a sequence of Unicode scalar values (extended grapheme clusters).

1 class

Array

Swift Array

Swift's Array<T> — an ordered, random-access collection of elements, backed by contiguous storage.

1 class

Dictionary

Swift Dictionary

Swift's Dictionary<K, V> — a collection of unique keys mapped to values, with O(1) average lookup.

1 class

Kotlin

3 modules

kotlin.String

Kotlin kotlin.String

Kotlin's String — an immutable sequence of UTF-16 code units, enhanced with extension functions.

1 class

kotlin.collections.List

Kotlin kotlin.collections.List

Kotlin's List<T> — an immutable ordered collection; MutableList<T> adds in-place mutation.

1 class

kotlin.collections.Map

Kotlin kotlin.collections.Map

Kotlin's Map<K, V> — an immutable key-value collection; MutableMap<K, V> adds mutation.

1 class

R

3 modules

base vector

R base vector

R's base vector functions — vectors are the fundamental data structure in R, holding elements of one type.

1 class

data.frame

R data.frame

R's data.frame — a tabular structure of rows and columns, the workhorse of base R data analysis.

1 class

stringr

R stringr

stringr — a tidyverse package providing a consistent, pipe-friendly API for string manipulation.

1 class

Bash

3 modules

string manipulation

Bash string manipulation

Bash parameter expansion — built-in string operations performed on shell variables without external tools.

1 class

arrays

Bash arrays

Bash indexed arrays — one-dimensional, sparse, integer-indexed collections of strings.

1 class

test/conditional

Bash test/conditional

Bash test expressions — file, string and numeric comparisons used in [ ] and [[ ]] conditionals.

1 class

Angular

1 module

@angular/core, @angular/common/http, @angular/router

Angular @angular/core, @angular/common/http, @angular/router

Angular core APIs — the @Component decorator and lifecycle, HttpClient for HTTP, and the Router for navigation.

3 classes

Vue 3

1 module

vue (Composition API)

Vue 3 vue (Composition API)

Vue 3 core APIs — reactivity primitives, component definition, and the composables convention.

3 classes

jQuery

1 module

jquery

jQuery jquery

jQuery core APIs — selector and engine, AJAX helpers, and DOM manipulation methods.

3 classes

Bootstrap

1 module

bootstrap (JS components)

Bootstrap bootstrap (JS components)

Bootstrap 5 component JavaScript API — programmatic control of modal, tooltip, popover, and dropdown.

1 class

HTML5

1 module

Canvas, Web Storage, Geolocation

HTML5 Canvas, Web Storage, Geolocation

HTML5 browser APIs — Canvas 2D drawing, Web Storage for client-side key/value data, and Geolocation.

3 classes

CSS3

1 module

Properties & Functions

CSS3 Properties & Functions

Modern CSS properties (flexbox, grid, transforms) and built-in functions (calc, var, gradients).

2 classes

Sass

1 module

Functions & Directives

Sass Functions & Directives

Sass built-in functions for color manipulation and the @mixin/@include/@extend control directives.

2 classes

Tailwind CSS

1 module

tailwind.config.js

Tailwind CSS tailwind.config.js

Tailwind CSS configuration — customizing the theme, controlling content sources, and dark mode strategy.

1 class

jQuery UI

1 module

Interactions & Widgets

jQuery UI Interactions & Widgets

jQuery UI APIs — interaction behaviors (draggable, droppable, sortable) and UI widgets (accordion, datepicker, dialog, tabs).

2 classes

jQuery Mobile

1 module

Page & Widgets

jQuery Mobile Page & Widgets

jQuery Mobile APIs — page navigation/transition system and touch-optimized widgets (listview, navbar, popup).

2 classes

Chart.js

1 module

Chart & Controllers

Chart.js Chart & Controllers

Chart.js APIs — the Chart constructor and lifecycle, plus controller-specific config for bar, line, and pie charts.

2 classes

ECharts

1 module

echarts.init & Option

ECharts echarts.init & Option

Apache ECharts APIs — instance lifecycle (init/setOption/resize) and the option object driving series, axes, and tooltip.

2 classes

AngularJS

1 module

angular.module, $scope, $http

AngularJS angular.module, $scope, $http

AngularJS (1.x) core APIs — module definition with controllers/services/directives, the $scope digest loop, and $http for XHR.

3 classes

Docker

2 modules

Dockerfile

Docker Dockerfile

Dockerfile instructions for building reproducible container images layer by layer.

1 class

Docker CLI

Docker Docker CLI

Docker command-line interface for building, shipping and running containers and images.

1 class

Kubernetes

2 modules

kubectl

Kubernetes kubectl

kubectl command-line tool for deploying and inspecting applications on a Kubernetes cluster.

1 class

Manifest

Kubernetes Manifest

YAML manifest fields shared by every Kubernetes resource object.

1 class

MongoDB

2 modules

Collection

MongoDB Collection

MongoDB collection methods for inserting, querying, updating and aggregating documents.

1 class

Operators

MongoDB Operators

MongoDB query and aggregation operators used to filter, transform and group documents.

1 class

MySQL

2 modules

SELECT

MySQL SELECT

MySQL SELECT statement clauses for querying and combining rows from one or more tables.

1 class

DDL

MySQL DDL

MySQL Data Definition Language for creating and altering tables, indexes and constraints.

1 class

PostgreSQL

2 modules

SELECT

PostgreSQL SELECT

PostgreSQL SELECT features including window functions, CTEs, LATERAL joins and RETURNING.

1 class

JSONB

PostgreSQL JSONB

PostgreSQL JSONB functions and operators for storing, querying and transforming JSON documents.

1 class

Redis

2 modules

String

Redis String

Redis String commands for storing, reading and atomically updating single values.

1 class

Collections

Redis Collections

Redis collection data type commands: lists, hashes, sets and sorted sets.

1 class

Nginx

2 modules

Directives

Nginx Directives

Nginx configuration directives used to define virtual servers, locations and proxying behavior.

1 class

Variables

Nginx Variables

Built-in Nginx variables exposing request and connection properties usable in directives.

1 class

Linux

2 modules

File Operations

Linux File Operations

Core Linux file and directory commands for listing, copying, moving, finding and changing permissions.

1 class

Text Processing

Linux Text Processing

Linux text-processing pipelines for filtering, transforming and summarizing streamed text.

1 class

SQLite

2 modules

SQL

SQLite SQL

SQLite SQL dialect for creating tables, inserting rows, querying data and inspecting schema metadata via PRAGMA.

1 class

CLI

SQLite CLI

sqlite3 command-line shell dot-commands for opening databases, dumping data and inspecting schemas.

1 class

Node.js

2 modules

Node.js fs

Node.js fs module for filesystem access including reading, writing, listing and inspecting paths.

1 class

http

Node.js http

Node.js http module for building HTTP servers and issuing HTTP clients requests.

1 class

C

1 module

stdio.h

C stdio.h

C 标准输入输出库,提供文件操作、格式化读写等核心函数。

1 class

cURL

1 module

CLI Flags

cURL CLI Flags

curl 命令行工具的常用选项,用于发送 HTTP 请求、传输数据。

1 class

HTTP

1 module

Methods & Status

HTTP Methods & Status

HTTP 协议的请求方法与状态码语义,定义客户端与服务器交互规范。

1 class

JSON

1 module

Data Types & Syntax

JSON Data Types & Syntax

JSON(JavaScript Object Notation)数据格式语法,用于数据交换。

1 class

Regular Expressions

1 module

Pattern Syntax

Regular Expressions Pattern Syntax

正则表达式模式语法,用于文本匹配、查找与替换。

1 class

CSS

1 module

Selectors & Properties

CSS Selectors & Properties

CSS 选择器与属性参考,用于精准定位并样式化文档元素。

1 class

HTML

1 module

Elements & Attributes

HTML Elements & Attributes

HTML 元素与属性参考,用于构建网页结构与语义内容。

1 class

SVG

1 module

Shapes & Paths

SVG Shapes & Paths

SVG 形状与路径元素参考,用于在网页中绘制矢量图形。

1 class

XML

1 module

Syntax & Structure

XML Syntax & Structure

XML 语法与结构参考,用于描述可扩展标记语言的构建要素。

1 class

YAML

1 module

Data Structures & Syntax

YAML Data Structures & Syntax

YAML 数据结构与语法参考,用于编写人类可读的配置与数据序列化。

1 class

Markdown

1 module

Syntax Reference

Markdown Syntax Reference

Markdown 语法参考,用于以纯文本格式编写可转换为 HTML 的富文本。

1 class

GraphQL

1 module

Query Language

GraphQL Query Language

GraphQL 查询语言参考,用于以声明式方式查询与操作 API 数据。

1 class

Django

1 module

ORM & Views

Django ORM & Views

Django ORM 提供强大的数据库抽象层,Views 处理 HTTP 请求与模板响应。

1 class

FastAPI

1 module

Path Operations & Dependency

FastAPI Path Operations & Dependency

FastAPI 基于类型注解构建高性能 API,支持自动校验、依赖注入与 OpenAPI 文档。

1 class

Flask

1 module

App & Request Context

Flask App & Request Context

Flask 是轻量级 WSGI 框架,通过应用与请求上下文管理路由、请求与响应。

1 class

NumPy

1 module

ndarray

NumPy ndarray

NumPy 提供高性能多维数组 ndarray 及向量化数值计算能力。

1 class

Pandas

1 module

DataFrame

Pandas DataFrame

Pandas 提供 DataFrame 与 Series,支持表格数据的读取、清洗、变换与分析。

1 class

Matplotlib

1 module

pyplot

Matplotlib pyplot

Matplotlib.pyplot 提供类 MATLAB 的绘图接口,可生成多种静态图表。

1 class

OpenCV

1 module

cv2

OpenCV cv2

OpenCV(cv2)提供图像读写、颜色转换、滤波、边缘检测与视频捕获等计算机视觉 API。

1 class

PyTorch

1 module

torch

PyTorch torch

PyTorch 提供动态计算图、张量运算与自动求导,广泛用于深度学习建模与训练。

1 class

TensorFlow

1 module

tf.keras

TensorFlow tf.keras

tf.keras 是 TensorFlow 的高层 API,提供层、模型、训练与数据管道抽象。

1 class

Machine Learning

1 module

scikit-learn

Machine Learning scikit-learn

scikit-learn 提供统一的 fit/predict API,涵盖预处理、分类、回归与模型评估。

1 class

NLP

1 module

nltk & transformers

NLP nltk & transformers

结合 NLTK 的经典文本处理能力与 Hugging Face Transformers 的预训练模型能力。

1 class

Dart

1 module

core

Dart core

Dart 核心库,提供基础类型、集合、异步与类定义等核心 API。

1 class

Delphi

1 module

RTL

Delphi RTL

Delphi 运行时库 SysUtils 单元,提供字符串、格式化、文件与类型转换等基础函数。

1 class

Elixir

1 module

Kernel & Enum

Elixir Kernel & Enum

Elixir 的 Kernel 与 Enum 模块,提供 IO、字符串、集合与进程相关函数。

1 class

Fortran

1 module

Intrinsics

Fortran Intrinsics

Fortran 内置函数与语句,覆盖 IO、数组操作与数值计算。

1 class

Haskell

1 module

Prelude

Haskell Prelude

Haskell Prelude 默认导入的标准函数与类型类。

1 class

Lua

1 module

Standard Library

Lua Standard Library

Lua 标准库,提供 string、table、通用函数与模块加载等 API。

1 class

MATLAB

1 module

Built-in Functions

MATLAB Built-in Functions

MATLAB 内置函数,涵盖显示、矩阵操作、数值计算与绘图。

1 class

Perl

1 module

Built-in Functions

Perl Built-in Functions

Perl 内置函数,涵盖 IO、字符串、列表、文件与定义检查。

1 class

Scala

1 module

Standard Library

Scala Standard Library

Scala 标准库,涵盖集合、Option、Future 与函数式语法结构。

1 class

Solidity

1 module

Global & Members

Solidity Global & Members

Solidity 全局变量与成员,涵盖交易上下文、断言、转账与事件。

1 class

Visual Basic

1 module

Functions

Visual Basic Functions

Visual Basic 内置函数与语句,涵盖 IO、字符串、类型转换与控制流。

1 class

Vim

1 module

Ex Commands & Functions

Vim Ex Commands & Functions

Vim Ex 命令与内置函数,涵盖帮助、文件、替换、缓冲区与脚本。

1 class

Git

1 module

Plumbing & Porcelain

Git Plumbing & Porcelain

Git 版本控制系统常用命令参考,涵盖仓库初始化、克隆、提交、分支、合并、变基与远程仓库管理。

1 class

Memcached

1 module

Protocol Commands

Memcached Protocol Commands

Memcached 协议命令参考,涵盖存储、读取、修改、比较交换与统计等核心操作。

1 class

React

1 module

Hooks & Components

React Hooks & Components

React Hooks API 参考,涵盖状态、副作用、上下文、reducer、ref、记忆化与布局副作用等核心钩子。

1 class

Redis CLI

1 module

CLI Commands

Redis CLI CLI Commands

redis-cli 命令行工具参考,涵盖连接、测试、键值操作、过期管理与服务器信息查询。

1 class

WebAssembly

1 module

JS API

WebAssembly JS API

WebAssembly JavaScript API 参考,涵盖模块编译、实例化、校验、内存、表与流式加载等核心接口。

1 class

Julia

1 module

Base.Array

Julia Base.Array

Julia's dense multidimensional array type — the central data structure for numerical and scientific computing, with element-wise broadcasting and rich indexing.

1 class

Assembly

1 module

x86-64 Instructions

Assembly x86-64 Instructions

Core x86-64 instructions for data movement, arithmetic, control flow, and Linux system calls (Intel/NASM syntax).

1 class

Erlang

1 module

erlang (process)

Erlang erlang (process)

The erlang module's core concurrency primitives — spawn, message sending, linking, and monitoring for building fault-tolerant systems.

1 class

Last updated: 2026-08-01