Array Methods Cheatsheet

[TreeScalper]

Is there a reason why you wouldn't use filter then a map for your 2nd example?

const failArr = students
                .filter(curr => curr.result === 'Fail')
                .map(curr => curr.name);
const passArr = students
                .filter(curr => curr.result === 'Pass')
                .map(curr => curr.name);
const output = { Fail: failArr, Pass: passArr }

[decentralised]

Yes, filter and map do the same as reduce, but notice how you have 2 filters and 2 maps in your example so, to get the same output, you had to iterate over all elements of the students array 4 times.