manipulate array of object within array of object base on property

Question

I want to build certain UI, it involves manipulation of array object, I know the pseudo code, but I don't know how to produce the output. Below is my case statement. Need guidance.

if outer date is in between of data's date_from and date_to

[{
  date:'2017-05-11',
  data:[{id: 2, name: 'abc', date_from:'2017-05-03', date_to:'2017-05-05'}]
}]

set type to mid

[{
  date:'2017-05-11',
  data:[{id: 2, name: 'abc', date_from:'2017-05-03', date_to:'2017-05-05', type:'mid'}]
}]

if outer date is equal to date_from

[{
  date:'2017-05-11',
  data:[{id: 2, name: 'abc', date_from:'2017-05-11', date_to:'2017-05-15'}]
}]

set type to is_start_left

if outer date is equal to date_to

[{
  date:'2017-05-11',
  data:[{id: 2, name: 'abc', date_from:'2017-05-01', date_to:'2017-05-11'}]
}]

set type to is_end_right

Nina Scholz · Accepted Answer · 2017-05-18 10:12:29Z

1

You could use a nested conditional (ternary) Operator ?: and check date_from, or date_to or return just 'mid'.

function setType(array) {
    array.forEach(a => a.data.forEach(o => o.type = a.date === o.date_from ?
        'is_start_left' :
        a.date === o.date_to ?
            'is_end_right' :
            'mid'
    ));
    return array;
}

console.log(setType([{ date: '2017-05-11', data: [{ id: 2, name: 'abc', date_from: '2017-05-03', date_to: '2017-05-05' }] }]));
console.log(setType([{ date: '2017-05-11', data: [{ id: 2, name: 'abc', date_from: '2017-05-11', date_to: '2017-05-15' }] }]));
console.log(setType([{ date: '2017-05-11', data: [{ id: 2, name: 'abc', date_from: '2017-05-01', date_to: '2017-05-11' }] }]));

.as-console-wrapper { max-height: 100% !important; top: 0; }

edited May 18, 2017 at 10:12

answered May 18, 2017 at 10:04

Nina Scholz

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2 Comments

Alan Jenshen Over a year ago

oh i see forEach within forEach. but i didn't know ternary operator can do multiple else.

Nina Scholz Over a year ago

@AlanJenshen, from this snippet, i hardly can tell where the error is.

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