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The asciiToHex function is a callable function in the web3-utils library that converts an ASCII string to its hexadecimal representation, prefixed by 0x. The resulting string will contain only hexadecimal digits (0-9, a-f) and will be prefixed with 0x to indicate that it's a hexadecimal representation.
Here's an example of how to use the asciiToHex function:
In this example, the asciiToHex function takes the ASCII string 'Hello World' as input and returns its hexadecimal representation, which is '0x48656c6c6f20576f726c64'.