`Range<Beg, End>`

The Range class provides generic range values for representing inclusive or exclusive ranges of ordered data types.

Import:

import { Range } from 'surrealdb';

Source: value/range.ts

Type Parameters

Beg - The type of the beginning bound
End - The type of the ending bound

Constructor

`new Range(begin, end)`

Create a new range value.

Syntax

new Range(begin, end)

Parameters

Parameter	Type	Description
`begin`	`Bound<Beg>`	The beginning bound (can be inclusive or exclusive).
`end`	`Bound<End>`	The ending bound (can be inclusive or exclusive).

Examples

// Numeric range [1, 100]
const numericRange = new Range(
    { value: 1, inclusive: true },
    { value: 100, inclusive: true }
);

// Date range
const dateRange = new Range(
    { value: DateTime.parse('2024-01-01'), inclusive: true },
    { value: DateTime.parse('2024-12-31'), inclusive: true }
);

// Half-open range [0, 10)
const halfOpen = new Range(
    { value: 0, inclusive: true },
    { value: 10, inclusive: false }
);

Properties

`begin`

The beginning bound of the range.

Type: Bound<Beg>

const range = new Range(
    { value: 1, inclusive: true },
    { value: 10, inclusive: true }
);

console.log(range.begin.value); // 1
console.log(range.begin.inclusive); // true

`end`

The ending bound of the range.

Type: Bound<End>

const range = new Range(
    { value: 1, inclusive: true },
    { value: 10, inclusive: true }
);

console.log(range.end.value); // 10
console.log(range.end.inclusive); // true

Instance Methods

`.toString()`

Convert to string representation.

Syntax

range.toString()

Returns

string - Range string (e.g., 1..10, 1..=10, 1>..10)

Examples

// Inclusive range [1, 10]
const inclusive = new Range(
    { value: 1, inclusive: true },
    { value: 10, inclusive: true }
);
console.log(inclusive.toString()); // '1..=10'

// Exclusive range (1, 10)
const exclusive = new Range(
    { value: 1, inclusive: false },
    { value: 10, inclusive: false }
);
console.log(exclusive.toString()); // '1>..10'

// Half-open [1, 10)
const halfOpen = new Range(
    { value: 1, inclusive: true },
    { value: 10, inclusive: false }
);
console.log(halfOpen.toString()); // '1..10'

`.toJSON()`

Serialize for JSON.

Syntax

range.toJSON()

Returns

string - Range string representation

`.equals(other)`

Check if two ranges are equal.

Syntax

range.equals(other)

Returns

boolean - True if equal

Complete Examples

Numeric Ranges

import { Surreal, Range } from 'surrealdb';

const db = new Surreal();
await db.connect('ws://localhost:8000');

// Define age range for filtering
const adultRange = new Range(
    { value: 18, inclusive: true },
    { value: 120, inclusive: true }
);

// Query with range
const adults = await db.query(`
    SELECT * FROM users 
    WHERE age IN $range
`, {
    range: adultRange
}).collect();

Date Ranges

import { DateTime, Range } from 'surrealdb';

// Define fiscal year
const fiscalYear = new Range(
    { value: DateTime.parse('2024-01-01T00:00:00Z'), inclusive: true },
    { value: DateTime.parse('2024-12-31T23:59:59Z'), inclusive: true }
);

// Query events in date range
const events = await db.query(`
    SELECT * FROM events 
    WHERE date IN $range
`, {
    range: fiscalYear
}).collect();

Price Ranges

import { Decimal, Range } from 'surrealdb';

// Define price range for product filtering
const budgetRange = new Range(
    { value: new Decimal('0'), inclusive: true },
    { value: new Decimal('100'), inclusive: true }
);

const products = await db.query(`
    SELECT * FROM products 
    WHERE price IN $range
`, {
    range: budgetRange
}).collect();

Score Ranges

// Grade ranges
const gradeA = new Range(
    { value: 90, inclusive: true },
    { value: 100, inclusive: true }
);

const gradeB = new Range(
    { value: 80, inclusive: true },
    { value: 89, inclusive: true }
);

// Assign grades
const students = await db.query(`
    SELECT *,
        CASE
            WHEN score IN $gradeA THEN 'A'
            WHEN score IN $gradeB THEN 'B'
            ELSE 'C'
        END AS grade
    FROM students
`, {
    gradeA,
    gradeB
}).collect();

Time-based Filtering

// Recent activity (last 30 days)
const now = DateTime.now();
const thirtyDaysAgo = now.minus(Duration.parse('30d'));

const recentRange = new Range(
    { value: thirtyDaysAgo, inclusive: true },
    { value: now, inclusive: true }
);

const recentActivity = await db.query(`
    SELECT * FROM activity_log 
    WHERE timestamp IN $range
    ORDER BY timestamp DESC
`, {
    range: recentRange
}).collect();

Pagination with ID Ranges

import { RecordId, Range } from 'surrealdb';

// Fetch records in ID range
const idRange = new Range(
    { value: new RecordId('users', 'a'), inclusive: true },
    { value: new RecordId('users', 'f'), inclusive: false }
);

const users = await db.query(`
    SELECT * FROM users 
    WHERE id IN $range
`, {
    range: idRange
}).collect();

Exclusive Ranges

// Exclusive range (not including boundaries)
const exclusive = new Range(
    { value: 0, inclusive: false },
    { value: 100, inclusive: false }
);
// Matches: 0 < x < 100

const results = await db.query(`
    SELECT * FROM measurements 
    WHERE value IN $range
`, {
    range: exclusive
}).collect();

Half-Open Ranges

// Half-open range [start, end)
const halfOpen = new Range(
    { value: 0, inclusive: true },
    { value: 10, inclusive: false }
);
// Matches: 0 <= x < 10

// Common for array-like indexing
const items = await db.query(`
    SELECT * FROM items 
    WHERE index IN $range
`, {
    range: halfOpen
}).collect();

Multiple Ranges

// Define multiple severity levels
const low = new Range(
    { value: 0, inclusive: true },
    { value: 3, inclusive: true }
);

const medium = new Range(
    { value: 4, inclusive: true },
    { value: 6, inclusive: true }
);

const high = new Range(
    { value: 7, inclusive: true },
    { value: 10, inclusive: true }
);

// Query by severity
const criticalIssues = await db.query(`
    SELECT * FROM issues 
    WHERE severity IN $range
`, {
    range: high
}).collect();

Range Queries in Application

function queryByRange<T>(
    start: T,
    end: T,
    inclusive: boolean = true
): Range<T, T> {
    return new Range(
        { value: start, inclusive },
        { value: end, inclusive }
    );
}

// Usage
const dateRange = queryByRange(
    DateTime.parse('2024-01-01'),
    DateTime.parse('2024-12-31')
);

const orders = await db.query(`
    SELECT * FROM orders 
    WHERE created_at IN $range
`, {
    range: dateRange
}).collect();

Range Notation

SurrealDB uses specific notation for ranges:

Notation	Description	Example
`a..=b`	Inclusive both ends `[a, b]`	`1..=10`
`a..b`	Inclusive start, exclusive end `[a, b)`	`1..10`
`a>..b`	Exclusive start, exclusive end `(a, b)`	`1>..10`
`a>..=b`	Exclusive start, inclusive end `(a, b]`	`1>..=10`

Best Practices

1. Use Appropriate Inclusivity

// Good: Inclusive for dates (including full days)
const dateRange = new Range(
    { value: DateTime.parse('2024-01-01T00:00:00Z'), inclusive: true },
    { value: DateTime.parse('2024-01-31T23:59:59Z'), inclusive: true }
);

// Good: Exclusive end for array-like indexing
const arrayRange = new Range(
    { value: 0, inclusive: true },
    { value: 10, inclusive: false }
); // [0, 10)

2. Type Safety

// Good: Explicit types
const range: Range<number, number> = new Range(
    { value: 1, inclusive: true },
    { value: 100, inclusive: true }
);

// Good: Consistent types
const dateRange: Range<DateTime, DateTime> = new Range(
    { value: DateTime.now(), inclusive: true },
    { value: DateTime.now().plus(Duration.parse('1d')), inclusive: true }
);

3. Validate Bounds

// Good: Ensure start <= end
function createRange<T>(start: T, end: T): Range<T, T> | null {
    if (start > end) {
        console.error('Invalid range: start must be <= end');
        return null;
    }
    
    return new Range(
        { value: start, inclusive: true },
        { value: end, inclusive: true }
    );
}

Use Cases

Filtering - Filter records by numeric, date, or other ordered values
Pagination - Query records in ID ranges
Time Windows - Define time-based query windows
Price Filtering - E-commerce price range searches
Score Categorization - Categorize by score ranges (grades, ratings)
Geographic Bounds - Coordinate ranges for maps

Range<Beg, End>

Type Parameters

Constructor

new Range(begin, end)

Parameters

Examples

Properties

begin

end

Instance Methods

.toString()

Returns

Examples

.toJSON()

Returns

.equals(other)

Returns

Complete Examples

Numeric Ranges

Date Ranges

Price Ranges

Score Ranges

Time-based Filtering

Pagination with ID Ranges

Exclusive Ranges

Half-Open Ranges

Multiple Ranges

Range Queries in Application

Range Notation

Best Practices

1. Use Appropriate Inclusivity

2. Type Safety

3. Validate Bounds

Use Cases

See Also

`Range<Beg, End>`

`new Range(begin, end)`

`begin`

`end`

`.toString()`

`.toJSON()`

`.equals(other)`