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To transform an array containing objects into a string, you can use the JSON.stringify() method in JavaScript. This method converts a JavaScript object into a JSON string representation.

Example:

const arr = [
  { name: "John", age: 30 },
  { name: "Jane", age: 25 },
  { name: "Bob", age: 40 }
];

const str = JSON.stringify(arr);

console.log(typeof str); // string
console.log(str); // '[{"name":"John","age":30},{"name":"Jane","age":25},{"name":"Bob","age":40}]'

In the example above, the array of objects is first passed to the JSON.stringify() method which returns a string containing the JSON representation of the array.