Can a destructuring assignment be used inside an object?
This is a valid example
const test = {a: 'hey', b: 'hello'}
const {a,b} = test;
const destruct = {
a,
b
};
Trying to achieve this behavior
const test = {a: 'hey', b: 'hello'}
// aiming for something like this
const destruct = {
{a,b}: test
};
const destruct = {
{a}: test,
{b}: test
};
If my understanding is correct, it appears that the spread syntax would be a suitable solution for your requirements.
The spread syntax "..." enables you to distribute the key/value pairs from a source object (such as test) to a target object (like destruct):
const test = {
a: 'hey',
b: 'hello',
c: 'goodbye'
}
const destruct = {
// {a,b}: test <-- invalid syntax
...test // achieves the same using the "spread" syntax
};
console.log(destruct)
Furthermore, if you wish to extract a subset of keys from a source object and include them in a target object, you can accomplish this as follows:
const test = {
a: 'hey',
b: 'hello',
c: 'goodbye'
}
/* Spread subset of keys from source object to target object */
const welcomeOnly = {
...({ a, b } = test, { a, b })
}
console.log('exclude goodbye, show welcomes only:', welcomeOnly);In the second example, we destructure the source object (namely test) into an object containing only the desired keys (a and b).
Within the scope of that expression (between the ( and )), these keys become accessible as local variables. We capitalize on this capability by passing them to a new object (i.e., { a, b }). Since the new object is declared after the ,, it takes precedence as the result of the expression.
If you want to extract specific properties from an object, you can utilize the rest operator.
const data = {
x: 'apple',
y: 'banana',
z: 'cherry'
};
const { z, ...otherProps } = data;
console.log(otherProps);This code snippet assigns the property 'z' to a constant variable and captures all other properties in the object with the rest operator. Make sure to list the properties to be excluded first before using the rest operator.
The same concept applies to arrays as well.
const data = ['apple', 'banana', 'cherry'];
const [ itemOne, ...remainingItems ] = data;
console.log(remainingItems);Here's an example of how you can destructure arrays in a different way!
let xyz = {
x: 'goodbye',
y: 'see ya',
z: 'farewell!'
}
let {x: alpha, y:beta, z:gamma} = xyz;
console.log(alpha,beta,gamma)
// "goodbye"
"see ya"
"farewell!"
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