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Destructuring assignment vs array.map


By : Vance
Date : July 31 2020, 04:00 PM
I wish this help you Don't use #1, at least not the way it is written. You are mutating the old state, which can easily cause bugs in react which assumes that state is immutable. You do create a new array, which is good, but you're not creating new elements inside the array. If you're changing one of the objects in the array, you need to copy that object before modifying it.
The better way to do #1 would be:
code :
handleLike = movie => {
  const movies = this.state.movies.map(m => {
    if (m._id === movie._id) {
      const copy = { ...m };
      copy.liked = !m.liked;
      return copy;
    }
    return m;
  });

  this.setState({ movies });
};


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JavaScript Array destructuring assignment and null value


By : slowest
Date : March 29 2020, 07:55 AM
Any of those help I'm using an external service getListOfItemsFromServiceA which accepts an id (of user) and returns a list of 5 items (exactly 5) associated to this user. , Do this:
code :
[item1, item2, item3, item4, item5] = exampleResult || [];

How to mix const and let when using object or array destructuring assignment in ES6?


By : Mario Castillo
Date : March 29 2020, 07:55 AM
may help you . It seems like you can't differentiate variable's declaration in a one line. However, you could split it into two lines and use a different variable declaration, depends on which variable you want to get.
code :
const { a } = foo; 
let { b } = foo;

Must use destructuring props assignment (react/destructuring-assignment)


By : sup
Date : March 29 2020, 07:55 AM
around this issue I've applied eslint airbnb standard to my code, so now this code:
code :
handleSubmit = (event) => {
    event.preventDefault();

    const {onSearch} = this.props
    const {value} = this.query
    onSearch(value)

    event.target.blur();
}

Destructuring with array of vars assignment in typescript


By : user2543229
Date : March 29 2020, 07:55 AM
will be helpful for those in need I have the following: , you can set the type of the state
code :
export interface IValueType { max: number }

let [formValues, setFormValues] = useState<IValueType>({max: 5})

Nested in object array destructuring with assignment


By : Abby
Date : March 29 2020, 07:55 AM
may help you . I have an object: , If you want to get first value of array then use the code below.
code :
const data ={
 rows:[1,2,3]
}
let {rows:[first]} = data;
console.log(first)
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