Add methods addAll, addAllUnique and removeAll

[arniu]

No description provided.

[flovilmart]

Can you please add new tests instead of altering existing ones?

[codecov]

Codecov Report

Merging #459 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #459      +/-   ##
==========================================
+ Coverage   85.39%   85.41%   +0.02%     
==========================================
  Files          46       46              
  Lines        3724     3730       +6     
  Branches      854      854              
==========================================
+ Hits         3180     3186       +6     
  Misses        544      544

Impacted Files	Coverage Δ
src/ParseObject.js	86.55% <100%> (+0.1%)	⬆️

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[flovilmart]

@arniu on the implementation side, those all all the same as add, addUnique, remove etc... Why not just change the accepted type to mixed | Array<mixed> as it is the same underlying implementation.

[arniu]

@flovilmart This is mainly due to compatibility considerations:

1. Keep the API consistent with other SDK's;
2. Keep backward compatible.

In the old version, you can use add to add tuples to the array. For example,

var obj = new Parse.Object('TestObject')
obj.add('array', [1, 2])
obj.add('array', [1, 2])

The result is [[1, 2], [1, 2]].

If you allow add batch to add objects, the result will be [1, 2, 1, 2].

[flovilmart]

My bad, I misread the code, as it looked very similar :)