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The isPromise function is a utility method that allows you to check whether a given object is a Promise. This function is useful when working with asynchronous code, as it enables you to easily determine whether a value is a Promise, and therefore whether it can be used with asynchronous methods like then and await.
The isPromise function takes a single parameter, object, which is the value that you want to check for Promise-ness. The function then returns a boolean value indicating whether object is a Promise or not.
The function checks whether object is a Promise by looking for the presence of a then method. If object has a then method, it is considered to be a Promise, and the function returns true. If object does not have a then method, the function returns false.
Here's an example usage of the isPromise function:
In this example, the isPromise function is called with two different values: a Promise object returned by the web3.eth.getAccounts() method, and a string value 'foo'. The function returns true for the Promise object, indicating that it is a Promise, and false for the string value, indicating that it is not a Promise.