What is the purpose of a JavaScript debugger?

What is the purpose of a JavaScript debugger? Correct Answer Placing script execution under control

A debugger is an application that places all aspects of script execution under the control of the programmer. Using the debugger statement has the same function as setting a breakpoint in the code. Debuggers provide fine-grained control over the state of the script through an interface that allows you to examine and set values as well as control the flow of execution.

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JavaScript is designed for following purpose