predictype

predictype v0.8.1

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predictype / predicates/maps / mapEntry

Function: mapEntry()

mapEntry<K, V>(source, oper, entry): boolean

Defined in: predicates/maps/mapEntry.ts:26

Checks if a Map contains (or lacks) a specific entry (key-value pair) using the specified operation.

Type Parameters

K

K

V

V

Parameters

source

Map<K, V>

The Map to check.

oper

MapEntryOper

The entry operation to perform (e.g. ‘has_entry’, ‘lacks_entry’).

entry

[K, V]

The [key, value] pair to check for.

Returns

boolean

True if the entry check is valid according to the operator, otherwise false.

Throws

If the operation is not recognized.

Example

const m = new Map([[1, 'a']]);
const entry1 = [1, 'a'];
const entry2 = [2, 'b'];

mapEntry(m, 'has_entry', entry1); // true
mapEntry(m, 'lacks_entry', entry2); // true

Remarks

Supported Operators:

• CONTAINS_ENTRY: Map contains the [key, value] entry
• LACKS_ENTRY: Map does not contain the [key, value] entry

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