Number type
A number type is a programming-language or data-system type whose values represent numeric quantities and support defined numerical operations.
Grokking Relational Database Design
NUMERIC is an SQL exact numeric data type that stores numbers with a declared precision and scale.
- How it is used
- Defines accurate fixed-point attributes, especially monetary values, during database design.
- How deep it goes
- Explains precision, scale, fixed-point accuracy, and type selection, without descending into storage internals.
- Examples
- Uses 12.3456, product prices and costs, and a spaceship recommended price declared as NUMERIC(8, 2).
- What you can do after
- Apply it to model monetary and other accuracy-sensitive attributes with an intentional precision and scale.
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Build Financial Software with Generative AI (From Scratch)
NUMERIC is a database data type for storing exact decimal numbers with specified precision and scale.
- How it is used
- Stores ACH debit and credit totals while enforcing numeric database input.
- How deep it goes
- Defines precision and scale, then follows amounts through parsing, database columns, API schemas, and UI mapping.
- Examples
- Uses ACH file-control debit and credit totals, fixed-width amount parsing, and a files API response.
- What you can do after
- Operate/configure numeric amount columns and trace their values from parsed ACH records to a displayed API response.
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Julia as a Second Language
A number is a mathematical value representing a quantity or position in a numerical system.
- How it is used
- Uses number types to choose numeric representations, interpret text input, and restrict coordinates to numeric values.
- How deep it goes
- Works through type inspection, integer bounds, overflow, parsing, hierarchy traversal, and parametric constraints; defers background on bit lengths and overflow.
- Examples
- Shows REPL checks for Int8 bounds, base-2 parsing, and Point and Vec2D definitions that reject nonnumeric coordinates.
- What you can do after
- Operate/configure Julia number types by checking limits, parsing strings into chosen types, and constraining numeric fields.
Math for Web Design
The number type is the JavaScript primitive type for numeric values, including integers and floating-point numbers.
- How it is used
- Supports arithmetic for dimensions, animations, dates, financial data, loops, comparisons, and other JavaScript calculations.
- How deep it goes
- Explains IEEE 754 storage, safe integer limits, decimal imprecision, coercion, rounding, randomness, and BigInt boundaries.
- Examples
- Uses unsafe-integer additions, approximate equality, carousel indexing, currency formatting, and random RGB color generation.
- What you can do after
- Diagnose/debug precision, coercion, rounding, unsafe-integer, and remainder problems in JavaScript calculations.
Essential TypeScript 5, Third Edition
The number type is the built-in JavaScript type for numeric values.
- How it is used
- Represents numeric values in JavaScript and supports calculations within dynamically typed programs.
- How deep it goes
- Defines the unified numeric type and demonstrates dynamic reassignment, but defers detailed type coercion mechanics.
- Examples
- Demonstrates prices, typeof output, reassignment, and tax calculations receiving number, string, and boolean arguments.
- What you can do after
- Diagnose unexpected calculations by checking whether values are numbers or strings and observing JavaScript coercion results.
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Clojure: The Essential Reference
A numeric type is a type whose values represent numbers with defined precision, range, and arithmetic behavior.
- How it is used
- Explains how numeric precision, range, promotion, rounding, and overflow affect arithmetic and hashing.
- How deep it goes
- Defines precision and contagion, then works through floating-point rounding and fixed-width overflow without detailing every numeric type.
- Examples
- Demonstrates unchecked operators, long boundary values, floating-point conversion, and a string hash using overflowing arithmetic.
- What you can do after
- Evaluate numeric behavior and choose explicit precision handling instead of relying on contagion rules.
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Related concepts
- integerincludes · An integer is a whole-number value with no fractional part, including negative numbers, zero, and positive numbers.
- floating-point arithmeticincludes · Floating-point arithmetic is computation using finite-precision representations of real numbers, which can introduce rounding and range errors.
- primitive data typekind of · A primitive data type is a fundamental, language-provided type for representing a basic value, rather than a composite of multiple values.
- complex floating-point typeincludes · A complex floating-point type represents complex numbers with real and imaginary components, using floating-point values for those components.
- booleanincludes · A Boolean is a logical type or value representing truth or falsity, conventionally with two states: true and false.
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