How to remove duplicates from array in react native

Question

The below code shows the array of duplicate data's , But I need a Unique data's from the array. I tried many steps, but I can't find the solution:

See the below image of the output of duplicate received

See the Image of duplicate data's

JS File

export default class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      storage: [],

    };
    this.renderData = this.renderData.bind(this);
  }
  renderData({ item, index }) {
  const datas = Array.from(new Set(item.category)); 
    return (
      <View>
        <Text>{datas}</Text>
      </View>
    );
  }
  componentDidMount() {
    fetch('http://myjsonpage', {
      method: 'post',
      headers: { 
        Accept: 'application/json',
        'Content-Type': 'application/json',},
      body: JSON.stringify({
        token: 'XXXXXX',
      }),
    }).then(response => { response.json().then(responseData => {
        if (responseData.status === 1) {
            this.setState({ datas:responseData.data}) ;
        } else {
          this.setState({ storage: [] });
        }
      });});}
  render() {
    return (
      <View style={styles.continer}>
        <View style={styles.heading}>
          <Text style={styles.font}> Most Common Categories </Text>
        </View>
        <View style={styles.item}>
          <FlatList data={this.state.datas} renderItem={this.renderData} />
        </View>
      </View>
    );}}

Thanks in Advance..!!

Does this answer your question? [Get all unique values in a JavaScript array (remove duplicates)](https://stackoverflow.com/questions/1960473/get-all-unique-values-in-a-javascript-array-remove-duplicates) — junwen-k, Nov 30 '19 at 07:13
You can use a Set: `this.setState({datas: [...new Set(responseData.data)]})` — Nick Parsons, Nov 30 '19 at 07:13
provide a sample data format that you receive and also post what you have tried — pavan kumar, Nov 30 '19 at 07:23
Thanks guys..!! I find a solution with loadus. const val = responseData.data; this.setState({ datas: _.uniqBy(val, 'category')} ); — Shankar, Nov 30 '19 at 10:09
@NickParsons When i setState i contacting two arrays, How can I remove the duplicate? I'm trying to use new Set() but not works `this.setState( { orders: [...new Set(this.state.orders.concat(this.allOrders))], })` — Oliver D, Apr 08 '20 at 22:38
@OliverD that should work fine. Maybe try: `this.setState(currState => ({ orders: [...new Set(currState.orders.concat(this.allOrders))], }))` — Nick Parsons, Apr 09 '20 at 03:07

Junius L · Answer 1 · 2019-11-30T12:08:39.717

5

There's many ways to remove duplicates from array, Use Sets to remove your duplicates.

const data = ['Renewal', 'Subscriptions', 'Subscriptions', 'Subscriptions', 'Renewal', 'Renewal']

const unique = new Set(data);

const uniqueData = [...unique]; // array

const data = ['Renewal', 'Subscriptions', 'Subscriptions', 'Subscriptions', 'Renewal', 'Renewal']

const uniqueData = [...new Set(data)];

console.log(uniqueData);

if (responseData.status === 1) {
   this.setState({ datas: [...new Set(responseData.data)] }) ;
 } else {
   this.setState({ storage: [] });
 }

edited Nov 30 '19 at 12:08

answered Nov 30 '19 at 09:08

Junius L

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which one is the array ```item.category``` or ```responseData.data```? – Junius L Nov 30 '19 at 09:26

How to remove duplicates from array in react native

1 Answers1