[NewFunc] Add MapUpdate for exsiting or new items only

[tiendc]

No description provided.

[codecov]

Codecov Report

Patch coverage: 71.42% and project coverage change: -0.60 ⚠️

Comparison is base (b2fcdfc) 99.38% compared to head (11c8bb3) 98.78%.

❗ Current head 11c8bb3 differs from pull request most recent head c57622d. Consider uploading reports for the commit c57622d to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #7      +/-   ##
==========================================
- Coverage   99.38%   98.78%   -0.60%     
==========================================
  Files          22       22              
  Lines         646      660      +14     
==========================================
+ Hits          642      652      +10     
- Misses          3        5       +2     
- Partials        1        3       +2     

Impacted Files	Coverage Δ
map.go	94.59% <71.42%> (-5.41%)	⬇️

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