The provided code snippet is in JavaScript: ```javascript let result = "hello".repeat(3); console.log(result); ``` ###...

The provided code snippet is in JavaScript:

let result = "hello".repeat(3);
console.log(result);

What the code does:

1. "hello".repeat(3):

   • The .repeat() method is called on the string "hello".
   • The .repeat() method creates and returns a new string consisting of the original string repeated n times, where n is the argument passed to the .repeat() method (in this case, 3).
   • So, "hello".repeat(3) effectively becomes "hellohellohello" (the string "hello" repeated 3 times).

2. console.log(result):

   • Logs the value stored in the variable result to the console.
   • The value of result is the string "hellohellohello", so this will be printed to the console.

Output:

hellohellohello

How .repeat() works under the hood:

• The .repeat() method is a built-in method of the JavaScript String prototype.
• Under the hood, it performs the following steps (conceptually):
  1. Input validation:
     • Checks if the string is a valid string.
     • Validates that the argument (count) is a non-negative, finite integer.
     • If a non-integer or invalid value is passed, it throws a RangeError. For example:
       • "hello".repeat(-1) will throw an error.
       • "hello".repeat(1.5) will first truncate 1.5 to 1.
       • If count is 0, an empty string ("") is returned.
  2. String construction:
     • Behind the scenes, it concatenates the original string to itself count times in a loop or using efficient native methods.
     • This is done efficiently to avoid manual string concatenation performance bottlenecks.

In summary, the .repeat() method simplifies the task of string repetition by abstracting these internal steps.