JavaScript Destructuring assignment Nested Destructuring
Example
We are not limited to destructuring an object/array, we can destructure a nested object/array.
Nested Object Destructuring
var obj = {
a: {
c: 1,
d: 3
},
b: 2
};
var {
a: {
c: x,
d: y
},
b: z
} = obj;
console.log(x, y, z); // 1,3,2
Nested Array Destructuring
var arr = [1, 2, [3, 4], 5];
var [a, , [b, c], d] = arr;
console.log(a, b, c, d); // 1 3 4 5
Destructuring is not just limited to a single pattern, we can have arrays in it, with n-levels of nesting. Similarly we can destructure arrays with objects and vice-versa.
Arrays Within Object
var obj = {
a: 1,
b: [2, 3]
};
var {
a: x1,
b: [x2, x3]
} = obj;
console.log(x1, x2, x3); // 1 2 3
Objects Within Arrays
var arr = [1, 2 , {a : 3}, 4];
var [x1, x2 , {a : x3}, x4] = arr;
console.log(x1, x2, x3, x4);
