Little-endian

As explained in Latency

A byte order that stores the least significant byte of a multi-byte value first and the most significant byte last.

Little-endian stores the least significant byte of a multi-byte value first and the most significant byte last. For a 32-bit value, this determines how consecutive memory bytes reconstruct the original number. section 7.3

Reading a 32-bit integer

The value 0xE011CFD0 appears in little-endian memory as 0xD0, 0xCF, 0x11, 0xE0. Likewise, order ID 1001 (0x000003E9) occupies bytes 0xE9, 0x03, 0x00, and 0x00. section 7.3

Byte order matters when serializing and deserializing data. CPU architecture determines in-memory order; little-endian is common on ARM and x86, while many network protocols default to big-endian. section 7.3

Figure 7.2 Serialization transforms the in-memory representation of data (shown on the left as a Rust struct) to a serialized format such as JSON (shown on the right). Deserialization performs the opposite transformation from a serialized format to an in-memory representation.

Use the figure to compare a Rust struct's in-memory representation with its JSON serialization and the reverse deserialization path. section 7.3

How Latency covers it

How deep it goes

Defines byte ordering and works through 32-bit layouts, but stops short of implementation code or broader protocol details.

Examples

Uses 0xE011CFD0, order ID 1001, a Rust order struct, and JSON serialization as concrete examples.

What you can do after

Evaluate/understand how multi-byte values occupy memory and transform between in-memory and serialized formats.

How it connects

Connects byte order with serialization, deserialization, CPU architecture, Rust, JSON, and big-endian representation.

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Also explained in

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  liveBookmanning.com
  Quantum Programming in DepthLittle-endian encoding orders a bit string or composite value with its least significant bit or component first.

Compare how 2 books explain little-endian →

Related concepts

• Qiskitused by · Qiskit is an open-source software development kit for constructing, simulating, compiling, and executing quantum circuits.
• endiannesskind of · Endianness is the convention that determines the order in which the bytes of a multibyte value are represented in memory or a serialized form.
• big-endiancontrasts with · Big-endian is an ordering convention in which the most significant byte or component of a multibyte value comes before its less significant components.
• ApplyControlledOnIntused by · ApplyControlledOnInt is a Q# standard-library operation that applies a gate when control qubits match an integer-encoded bit pattern.

This explainer was generated by Manning's knowledge graph from the text of Latency. The section links point to the parts of the book it draws on.