[removed] filter() for Objects

Question

ECMAScript 5 has the filter() prototype for Array types, but not Object types, if I understand correctly.

How would I implemen

Answer 1

Solution in Vanilla JS from year 2020.

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let romNumbers={'I':1,'V':5,'X':10,'L':50,'C':100,'D':500,'M':1000}

You can filter romNumbers object by key:

const filteredByKey = Object.fromEntries(Object.entries(romNumbers).filter(([key, value]) => key === 'I'))
// filteredByKey = {I: 1} 

Or filter romNumbers object by value:

 const filteredByValue = Object.fromEntries(Object.entries(romNumbers).filter(([key, value]) => value === 5))
 // filteredByValue = {V: 5}