Extract the last item which matches the condition-CodePudding

I have an array of objects, where I am checking for a boolean property, I need to get the last one from the array of objects which is true and need to get the name property.

This is what I have done, is there any better approach or simple way to achieve this:

const a = [{is_done: true, name: 'a'}, {is_done: true, name: 'b'}, {is_done: false, name: 'c'}]


let output = a.filter(a => a.is_done).slice(-1)[0].name


console.log(output)

CodePudding user response：

You can achieve this by first applying reverse and then using find which will return the first item which corresponds to the condition you specify.

const a = [{is_done: true, name: 'a'}, {is_done: true, name: 'b'}, {is_done: false, name: 'c'}]

const res = a.reverse().find(x => x.is_done);

console.log(res.name)

Please also note that in the near future, you will be able to use findLast and findLastIndex which are currently in stage 3 - https://github.com/tc39/proposals