startsWith()

The startsWith() function checks whether a string starts with the given string. It takes two arguments:

• The first argument is either a literal string or a JSON pointer that represents the field or value to be checked.

• The second argument is the string to be checked in the first argument. The function returns true if the string or field value represented by the first argument starts with the string specified in the second argument and false otherwise.

For example, to check whether the value of a field name message starts with a string "abcd", use the startsWith() function as follows:

startsWith('/message', 'abcd')

This call returns true if the message field starts with the string abcd or false if it does not.

Alternatively, you can use a literal string as the first argument:

startsWith('abcdef', 'abcd')

In this case, the function returns true because the string abcdef starts with abcd.

The startsWith() function performs a case-sensitive check.