🔤String

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Also known as: Text, Character String

An ordered sequence of characters used to represent text data in computing.

DESCRIPTION

A string is a data type representing textual information as a sequence of characters, often encoded with Unicode. Strings can be immutable or mutable depending on the language. Common operations include concatenation, slicing, searching, and pattern matching via regular expressions. Proper handling requires awareness of encodings, normalization, locale, and escaping. Strings appear in schemas, APIs, filenames, and user input, making validation and sanitization critical.

ALTERNATIVE DEFINITIONS

Wikipedia

In computer programming, a string is traditionally a sequence of characters, either as a literal constant or as some kind of variable.

Highlights strings as sequences used as literals or variables.

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Python Documentation

Textual data in Python is handled with str objects, which are immutable sequences of Unicode code points.

Emphasizes immutability and Unicode handling in Python.

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Oracle Java SE Documentation

The String class represents character strings.

Defines Java’s String as the class representing character sequences.

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RELATED TERMS

Unicode Character Encoding UTF-8 Regular Expression Tokenization Parsing Immutable Type Byte Array Concatenation Escape Sequence

COMPETING TERMS

Numeric Binary

KNOWLEDGE AREAS

Programming Languages Software Engineering Data Modeling

TARGET AUDIENCE

Software Developer Data Engineer Data Modeler Analytics Engineer

EXTERNAL SOURCES

• Wikipedia - String (computer science)
• Unicode Consortium - Unicode standard overview
• IETF - UTF-8 RFC specification
• PostgreSQL - Character type documentation

TOP QUESTIONS

What is a String in programming?

A String is an ordered sequence of characters representing text, typically encoded with Unicode or other character sets.

Category: Definition

Why does Unicode matter for Strings?

Unicode standardizes how characters are represented across languages. Correct encoding avoids garbled text, mismatched lengths, and security issues.

Category: Relevancy

Are Strings immutable?

Many languages (e.g., Python, Java) make strings immutable, improving safety and performance characteristics, while others offer mutable string types.

Category: Overview

What mistakes occur with String handling?

Ignoring encodings, incorrect normalization, poor locale handling, and unsafe concatenation leading to injection vulnerabilities are common pitfalls.

Category: Mistakes

How should Strings be validated?

Use whitelists, length constraints, canonicalization, and regular expressions; always sanitize untrusted input to prevent injection attacks.

Category: Requirements

What is a hot topic around Strings?

Efficient Unicode processing, grapheme-aware operations, and security-safe formatting APIs are active areas of development.

Category: Topic

How do Strings compare to Binary data?

Strings represent human-readable text, while binary captures arbitrary bytes. Conversions require careful encoding and decoding.

Category: Comparison

Where should I learn more about Strings?

Study official language docs, Unicode standards, and encoding specifications like UTF-8 and UTF-16.

Category: Learning

How do Strings affect storage and performance?

Encoding efficiency, collation, and indexing choices impact storage size, sorting behavior, and query speed.

Category: Performance