JS Object Array Remove last empty element

Question

I have that javascript object :

MyObject = [
   {
     "name" : "aaa",
     "firstname" : "aaaaa"
   },
   {
     "name" : "bbb",
     "firstname" : "bbbb"
   },
   {
     "name" : "cccc",
     "firstname" : "" <--------- firstname is empty, but the element is not in the last
   },
   {
     "name" : "ddd",
     "firstname" : "dddd"
   },
   {
     "name" : "eeee",
     "firstname" : ""  <--------- firstname is empty
   },
   {
     "name" : "fffff",
     "firstname" : ""  <--------- firstname is empty
   },
]

I want to delete the lastest lines that have "firstname" empty ... (a sort of trim) ... i dont want to remove all lines that have "firstname" empty... but just who are in the latestes lines. (that are in the bottom)

So, the result will be :

MyObject = [
   {
     "name" : "aaa",
     "firstname" : "aaaaa"
   },
   {
     "name" : "bbb",
     "firstname" : "bbbb"
   },
   {
     "name" : "cccc",
     "firstname" : ""
   },
   {
     "name" : "ddd",
     "firstname" : "dddd"
   }
]

Thank you

Can you show us the code you have so far?

qxz
– qxz

2017-01-20 16:17:06 +00:00
Commented Jan 20, 2017 at 16:17 — qxz
– qxz, Commented Jan 20, 2017 at 16:17
How you define "lastest"?

Allen
– Allen

2017-01-20 16:18:20 +00:00
Commented Jan 20, 2017 at 16:18 — Allen
– Allen, Commented Jan 20, 2017 at 16:18

adeneo · Accepted Answer · 2017-01-20 16:34:10Z

1

You can pop of at the end of the array as long as the firstname is empty

var MyObject = [{
    "name": "aaa",
    "firstname": "aaaaa"
}, {
    "name": "bbb",
    "firstname": "bbbb"
}, {
    "name": "cccc",
    "firstname": ""
}, {
    "name": "ddd",
    "firstname": "dddd"
}, {
    "name": "eeee",
    "firstname": ""
}, {
    "name": "fffff",
    "firstname": ""
}];

for (var i=MyObject.length;i--;) if (MyObject[i].firstname==="") MyObject.pop(); else break;

console.log(MyObject)

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edited Jan 20, 2017 at 16:34

answered Jan 20, 2017 at 16:21

adeneo

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2 Comments

jcubic Over a year ago

It didn't remove item "name": "eeee"

adeneo Over a year ago

@jcubic - I assumed "the lastest lines" was just the last item. I think I misunderstood that ?

jcubic · Accepted Answer · 2017-01-20 16:20:28Z

0

Try this:

var MyObject = [
   {
     "name" : "aaa",
     "firstname" : "aaaaa"
   },
   {
     "name" : "bbb",
     "firstname" : "bbbb"
   },
   {
     "name" : "cccc",
     "firstname" : ""
   },
   {
     "name" : "ddd",
     "firstname" : "dddd"
   },
   {
     "name" : "eeee",
     "firstname" : ""
   },
   {
     "name" : "fffff",
     "firstname" : ""
   }
];
var i = MyObject.length;
while(true) {
  if (!MyObject[--i].firstname) {
    MyObject.pop();
  } else {
    break;
  }
}
console.log(MyObject);

answered Jan 20, 2017 at 16:20

jcubic

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