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Javascript Destructuring an array

An array can be destructured when being assigned to a new variable.


const triangle = [3, 4, 5];
const [length, height, hypotenuse] = triangle;
length === 3;
height === 4; 
hypotneuse === 5;

Output

true
true
true

Elements can be skipped


const [,b,,c] = [1, 2, 3, 4];
console.log(b, c);

Output

2, 4

Rest operator can be used too


const [b,c, ...xs] = [2, 3, 4, 5];
console.log(b, c, xs); 

Output

2, 3, [4, 5]

An array can also be destructured if it's an argument to a function.


function area([length, height]) {
 return (length * height) / 2;
}
const triangle = [3, 4, 5];
area(triangle);

Output

6


Conclusion

In this page (written and validated by ) you learned about Javascript Destructuring an array . What's Next? If you are interested in completing Javascript tutorial, your next topic will be learning about: Javascript Removing duplicate elements.



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