Callback Function | JavaScript Tutorial in Hindi
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javascrip
Asynchronous Operations:
Callbacks are commonly used in asynchronous programming, where operations do not necessarily occur in a linear sequence. Instead, tasks can be executed independently, and their results are handled when they become available.
Function as a Parameter:
In languages like JavaScript, for example, functions can be treated as first-class citizens, meaning they can be assigned to variables, passed as arguments to other functions, and returned as values.
Execution After Completion:
When a function with a callback parameter is called, the callback function is provided as an argument. This callback is then executed once the main operation or task is completed.
Handling Responses or Results:
Callbacks are often used in scenarios like handling the response from an API request, reading a file, or processing data. The callback function specifies what should happen with the result of the operation.
Event Handling:
In event-driven environments, such as web development, callbacks are commonly used to respond to user actions (clicks, input, etc.) or system events.
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