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Is there a better way to get the first character of a GNU make variable than
FIRST=$(shell echo $(VARIABLE) | head -c 1)
(which is not only unwieldy but also calls the external shell)?
210
The idea is to use charAt() method of String class to find the first and last character in a string. The charAt() method accepts a parameter as an index of the character to be returned. The first character in a string is present at index zero and the last character in a string is present at index length of string-1 .
So you can easily use $i[0] to fetch first letter.
To access the first character of a string, we can use the (substring) parameter expansion syntax ${str:position:length} in the Bash shell. position: The starting position of a string extraction.
TypeScript - String charAt() charAt() is a method that returns the character from the specified index. Characters in a string are indexed from left to right. The index of the first character is 0, and the index of the last character in a string, called stringName, is stringName.
This is pretty horrible, but at least it doesn't invoke shell:
$(eval REMAINDER := $$$(VAR)) # variable minus the first char
FIRST := $(subst $(REMAINDER),,$(VAR)) # variable minus that
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