Modifying an object in Javascript?

Question

I have an object of the following kind:

{ body: { entry: { body: '' }, context: '' },
  contextids: 
   [ { uid: 'ff992fa0-817a-11e4-bea0-299f5e3c3819',
       name: 'deemeetreesNotebook' },
     { uid: 'ff992fa1-817a-11e4-bea0-299f5e3c3819', name: 'public' },
     { uid: 'ff992fa2-817a-11e4-bea0-299f5e3c3819', name: 'ideas' },
     { uid: 'ff992fa3-817a-11e4-bea0-299f5e3c3819',
       name: 'thingsToLearn' },
     { uid: 'ff992fa4-817a-11e4-bea0-299f5e3c3819',
       name: 'wayToRussia' },
     { uid: 'ff992fa5-817a-11e4-bea0-299f5e3c3819',
       name: 'polysingularity' },
     { uid: 'ff992fa6-817a-11e4-bea0-299f5e3c3819',
       name: 'infranodus' },
     { uid: 'ff992fa7-817a-11e4-bea0-299f5e3c3819',
       name: 'artmital' } ],
  internal: 1 }

I want to reiterate through this object, and modify it in the way that it only keeps the contextids where name equals a certain string (e.g. thingsToLearn).

What is a good way to remove unwanted contextids from my original object?

Thanks!

Use Array#filter.

Felix Kling
– Felix Kling

2014-12-11 21:40:26 +00:00
Commented Dec 11, 2014 at 21:40 — Felix Kling
– Felix Kling, Commented Dec 11, 2014 at 21:40
^ that, contextids is an array !

adeneo
– adeneo

2014-12-11 21:41:10 +00:00
Commented Dec 11, 2014 at 21:41 — adeneo
– adeneo, Commented Dec 11, 2014 at 21:41
jsfiddle.net/0hjc7dgL

adeneo
– adeneo

2014-12-11 21:43:27 +00:00
Commented Dec 11, 2014 at 21:43 — adeneo
– adeneo, Commented Dec 11, 2014 at 21:43

tymeJV · Accepted Answer · 2014-12-11 21:40:41Z

1

Loop, check, splice:

var nameToKeep = "someId";
for (var i = 0; i < data.contextids.length; i++) {
    if (data.contextids[i].name != nameToKeep) {
        data.contextids.splice(i, 1);
        i--;
    }
}

answered Dec 11, 2014 at 21:40

tymeJV

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1 Comment

Adam Over a year ago

The only things I would change about this answer would be to write it functionally and write data.contextids[i].name !== nameToKeep in the if statement, because !== is best practice

Matt Burland · Accepted Answer · 2014-12-11 21:43:21Z

Sounds like a job for Array.filter:

var d = {
  body: {
    entry: {
      body: ''
    },
    context: ''
  },
  contextids: [{
    uid: 'ff992fa0-817a-11e4-bea0-299f5e3c3819',
    name: 'deemeetreesNotebook'
  }, {
    uid: 'ff992fa1-817a-11e4-bea0-299f5e3c3819',
    name: 'public'
  }, {
    uid: 'ff992fa2-817a-11e4-bea0-299f5e3c3819',
    name: 'ideas'
  }, {
    uid: 'ff992fa3-817a-11e4-bea0-299f5e3c3819',
    name: 'thingsToLearn'
  }, {
    uid: 'ff992fa4-817a-11e4-bea0-299f5e3c3819',
    name: 'wayToRussia'
  }, {
    uid: 'ff992fa5-817a-11e4-bea0-299f5e3c3819',
    name: 'polysingularity'
  }, {
    uid: 'ff992fa6-817a-11e4-bea0-299f5e3c3819',
    name: 'infranodus'
  }, {
    uid: 'ff992fa7-817a-11e4-bea0-299f5e3c3819',
    name: 'artmital'
  }],
  internal: 1
};

d.contextids = d.contextids.filter(function(item) {
  return item.name === "thingsToLearn";
  });

alert(JSON.stringify(d.contextids));

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