The difference between { } and [ ] in mongoose?

Question

What is the main difference between { } and [ ] ?

I want to know when to use it and how stores the data

education: [
    {
      school: {
        type: String,
        required: true
      },
      fieldofstudy: {
        type: String,
        required: true
      },
      from: {
        type: Date,
        required: true
      },
      to: {
        type: Date
      },
      current: {
        type: Boolean,
        default: false
      },
      description: {
        type: String
      }
    }
  ]


social: {
    youtube: {
      type: String
    },
    twitter: {
      type: String
    },
    facebook: {
      type: String
    },
    linkedin: {
      type: String
    },
    instagram: {
      type: String
    }
  }

I would love to see some examples to understand where to use it and when not to use it.

https://www.google.com/search?q=javascript+arrays+and+objects — Neil Lunn, Nov 23 '18 at 06:02
Though the question likely illustrates a lack of understanding for JavaScript itself and the other references will help, then I would also suggest reading the MongoDB manual section on [Data Modeling](https://docs.mongodb.com/manual/data-modeling/) as a good place to start — Neil Lunn, Nov 23 '18 at 06:13

score 0 · Answer 1 · edited Nov 23 '18 at 07:05

0

{ } can contain index data (with string indexes), while [ ] can only contain unindexed data (which numerically indexed by default).

As your example suggests,

Here, data is on 0 index by default:

education: [{
  school: {
    type: String,
    required: true
  },
  fieldofstudy: {
    type: String,
    required: true
  },
  from: {
    type: Date,
    required: true
  },
  to: {
    type: Date
  },
  current: {
    type: Boolean,
    default: false
  },
  description: {
    type: String
  }
}]

Here data have string indexed

social: {
    youtube: {
      type: String
    },
    twitter: {
      type: String
    },
    facebook: {
      type: String
    },
    linkedin: {
      type: String
    },
    instagram: {
      type: String
    }
}

edited Nov 23 '18 at 07:05

enxtur

2,395
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answered Nov 23 '18 at 06:03

Milind Singh

296
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`while [ ] can only contain unindexed data` This is unfortunately false. Arrays can contain pretty much the same sort of key-value pairs as objects, it's just an abuse of their structure to do so. Also, your code doesn't look great, strings require delimiters. – CertainPerformance Nov 23 '18 at 06:07
@CertainPerformance I know its "(which numerically indexed by default)" as added. Also, your code doesn't look great, strings require delimiters. I didn't get?? – Milind Singh Nov 23 '18 at 06:09

The difference between { } and [ ] in mongoose?

1 Answers1