Keyestudio EASY PLUG Ultimate Starter Kit Manual page 30

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Returns the ASCII code corresponding to a char.
Converts a number into a string.
Calculates the length of a string
Output the char of a string (the char at 0 of hello is h)
The first string equals or startsWith or endsWith the
second string, returns 1, otherwise returns 0.
(if equals, both strings are abc, returns 1.)
Returns a decimal value of the first string subtracts
the second string.
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