setstate find opject in state and update

this.setState(prevState => {
  let jasper = Object.assign({}, prevState.jasper);  // creating copy of state variable jasper
  jasper.name = 'someothername';                     // update the name property, assign a new value                 
  return { jasper };                                 // return new object jasper object
})

//2ND METHOD

this.setState(prevState => ({
    jasper: {                   // object that we want to update
        ...prevState.jasper,    // keep all other key-value pairs
        name: 'something'       // update the value of specific key
    }
}))

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3.33

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Alaa Mustafa 130 points

                                    this.setState(prevState =&gt; ({
  food: {
    ...prevState.food,           // copy all other key-value pairs of food object
    pizza: {                     // specific object of food object
      ...prevState.food.pizza,   // copy all pizza key-value pairs
      extraCheese: true          // update value of specific key
    }
  }
}))

Thank you! 3

3.33 (3 Votes)

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