Converts a value to a string.
If a second parameter is provided, repeats the string up to 1000 times.
str(value) str(value, count)
str(123); // returns "123"
str("A", 3); // returns "AAA"
str(5.5, 2); // returns "5.55.5"
str("Hi", -1); // returns ""
str strlen padleft padright hex bin chr match