str = "hello"
wrl = " world!"
str[1]='a'
str[1]
str
length(str)
new = str + wrl
print("length is: ", length(new), "\n");
a = { str1: "hello", str2: " japan!" }
a[#str1]+=a[#str2]
str * 10
str * -1
str * str
str[0:5]="ok"