Optimize map key check in get_key - #10
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I added a simple benchmark test, and added a optimized path in get_key that can verify the key exists without having to iterate all the keys (at least in a common case)
before
pkg: github.com/oliveagle/jsonpath
Benchmark_JsonPathLookup-8 100000 14529 ns/op
pkg: github.com/oliveagle/jsonpath
Benchmark_JsonPathLookup-8 100000 13516 ns/op