My objective involves destructuring a large nested object and assigning its properties to variables. Currently, I am doing it this way:
const { name, country, sunrise, sunset, timezone } =
this.state.weather?.city || {};
const { temp, feels_like } =
this.state.weather.list?.[0].main || {};
Are there any alternative methods that could make this code more concise?
Important points:
Utilizing object destructuring:
const data = { id: 1, name: "SO" }
const { id, name, city = "N/A" } = data
console.log(id, name, city);Employing array destructuring:
const data = [ 1, 2 ]
const [first, second, third = "N/A"] = data
console.log(first, second, third)Managing array of objects using destructuring:
const data = [ {id: 1, name: "SO"} ]
const [ { id, name, city = "N/A" }, second = {} ] = data
console.log(id, name, city, second)Below is the procedure for Nested object and array destructuring:
// Input data
const that = {
state: {
weather: {
city: {
name: "new york",
country: "usa",
sunrise: "6 AM",
sunset: "7 PM",
timezone: "-4"
},
list: [{
main: {
temp: 10,
feels_like: 14
}
}]
}
}
};
// Nested Destructuring
const {
city: {
name,
country,
sunrise,
sunset,
timezone
},
list: [{
main: {
temp,
feels_like
}
}, second]
} = that.state.weather;
// Results
console.log(name, country, sunrise, sunset, timezone);
console.log(temp, feels_like);With default values to prevent errors - "can not read property of undefined":
// Input data
const that = {
state: {}
};
// Nested Destructuring
const {
city: {
name,
country,
sunrise,
sunset,
timezone
} = {},
list: [{
main: {
temp,
feels_like
} = {}
} = {}, second] = []
} = that.state.weather ?? {};
// Results
console.log(name, country, sunrise, sunset, timezone);
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