Add.go
Given a JSON dictionary containing x and y, outputs the sum of x and y.
Extra keys in the dictionary will be ignored. Missing keys will default to zero.
Usage
add [-v] <input file path>
The program will also read directly from standard input, e.g.:
echo '{"x": 5.5, "y": -1.542}' | add
add < somefile.json
Verbose flag
If the -v or --verbose flag is provided on the command line, the entire expression will be output rather than just the result, for example:
> echo '{"x": 5.5, "y": -1.542}' | add
3.958
> echo '{"x": 5.5, "y": -1.542}' | add -v
5.5 + -1.542 = 3.958