Adds "tobool" builtin function for converting strings to booleans #2098
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A builtin function for converting strings to booleans.
brahmlower
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Apr 14, 2020
Had to add a custom jq function to handle the conversion from string to booleans. Opened a PR to jq which would add the `tobool` as a builtin function: jqlang/jq#2098 Looks like releases aren't cut very often, so don't hold your breath.
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This PR adds a builtin
toboolfunction which converts string values to booleans, similar totonumber.This was motivated by the need to create a boolean value based on a value provided through an environment variable. All environment variables are strings, so I needed some mechanism to convert from a string to a boolean. A contrived example of what I wanted (and what this PR implements) is:
This boolean conversion is already achievable using a function defined in the filter:
$ TEST=true jq --null-input 'def tobool: {"true":true, "false":false}[ . | tostring ]; {"mytest": env.TEST | tobool}'The inline function definition is rather unwieldily for my use case, making the availability of the builtin function more appealing.