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Yes, you can assign a variable within destructuring assignment using 'let' and then reassign it later. Here's an example:
let {a, b} = {a: 1, b: 2};
console.log(a); // output: 1
console.log(b); // output: 2
a = 3;
console.log(a); // output: 3
In this example, we are destructuring an object to assign the values of its properties to variables 'a' and 'b'. We then reassign the value of 'a' to 3, and log it to the console to confirm the change.