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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/IDBKeyRange/includes below:

IDBKeyRange: includes() method - Web APIs

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Note: This feature is available in Web Workers.

The includes() method of the IDBKeyRange interface returns a boolean indicating whether a specified key is inside the key range.

key

The key you want to check for in your key range. This can be any type.

A boolean value.

DataError DOMException

Thrown if the supplied key was not a valid key.

const keyRangeValue = IDBKeyRange.bound("A", "K", false, false);

keyRangeValue.includes("F");
// Returns true

keyRangeValue.includes("W");
// Returns false

• Using IndexedDB
• Starting transactions: IDBDatabase
• Using transactions: IDBTransaction
• Setting a range of keys: IDBKeyRange
• Retrieving and making changes to your data: IDBObjectStore
• Using cursors: IDBCursor
• Reference example: To-do Notifications (View the example live).

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