json_escape(s) private

A utility method for escaping HTML entities in JSON strings using uXXXX JavaScript escape sequences for string literals:

json_escape('is a > 0 & a < 10?')
# => is a \u003E 0 \u0026 a \u003C 10?

Note that after this operation is performed the output is not valid JSON. In particular double quotes are removed:

# => {name:john,created_at:2010-04-28T01:39:31Z,id:1}
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