Splice(remove) method works exactly opposite of its actual work

[Robiullah2244]

I am expecting to only remove the given index in "deleteNumber" method . But Its doing exactly opposite. It removes all indexes except given index.

deleteNumber = (index) => {
    console.log("index: ", index);
    this.setState((state) => {
      const numbers = state.numbers.splice(index, 1);
      return(
        {
          numbers: numbers,
        }
      )
    })
  }

  render()
  {
    const numbers = this.state.numbers.map((number, index) => (
      
      <View style={{width: "100%", padding: 10, backgroundColor: "#eee", margin: 5}} key={index}>
        <Text><Icon size={25} name='ios-trash' color="red" onPress={()=> this.deleteNumber(index)}></Icon> {number}</Text>
      </View>
      
    ))

    return (
      <View style={{flex: 1,flexDirection:"column"}}>
        <Text style={{textAlign:"center", color: "#FBEAEB", fontSize: 50, backgroundColor:"#2F3C7E"}}>Security Notifier</Text>
        <View style={{
          flex: 1,
          flexDirection: 'column',
          justifyContent: 'center',
        }}>
          <View style={{padding: 20}}>
            <TextInput 
                style={{ height: 40, borderColor: 'gray', borderWidth: 1 }}
                onChangeText={(newNumber) => this.setState({ newNumber })}
                placeholder="Enter Phone Number"
                defaultValue=""
                value={this.state.newNumber}
            />
            <View style={{paddingTop: 5}}>
              <Button title="Add Number" onPress = {() => this.addNumber()}/>
            </View>
          </View>
          <View>
            {numbers}
          </View>
        </View>
      </View>
    );
  }

React Native version: 0.60.5
System:
OS: Windows 10
CPU: (6) x64 Intel(R) Core(TM) i5-8400 CPU @ 2.80GHz
Memory: 3.40 GB / 15.66 GB
Binaries:
Node: 10.16.3 - C:\Program Files\nodejs\node.EXE
Yarn: 1.17.3 - C:\Users\USER\AppData\Roaming\npm\yarn.CMD
npm: 6.9.0 - C:\Program Files\nodejs\npm.CMD
IDEs:
Android Studio: Version 3.4.0.0 AI-183.6156.11.34.5692245

[e1ferapontov]

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice

Return value: An array containing the deleted elements. If only one element is removed, an array of one element is returned. If no elements are removed, an empty array is returned.

You should learn how splice works.

[Robiullah2244]

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice

Return value: An array containing the deleted elements. If only one element is removed, an array of one element is returned. If no elements are removed, an empty array is returned.

You should learn how splice works.

Oh sorry. It's my fault. And many many thanks