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smrchy/intersection_diffenrence_union_hints.md

Created March 21, 2016 14:38
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intersection_diffenrence_union_hints.md

Intersection / Difference / Union Hints

Which elements are new in new_array compared to old_array

old_array = [1, 4, 5]
new_array = [1, 2, 3, 4]

_.difference(new_array, old_array)

// [2, 3]

Which elements of old_array are missing in new_array

old_array = [1, 4, 5]
new_array = [1, 2, 3, 4]

_.difference(old_array, new_array)

// [5]
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