In TypeScript, we can use the until keyword to execute a block of code repeatedly until a specific condition is met. The syntax is similar to the while loop, but with an inverted condition. The basic structure is as follows:
until (condition) {
// code to be executed repeatedly
}
The condition is evaluated before each iteration of the loop. If the condition is true, the loop continues; otherwise, the loop exits.
Here are some examples to illustrate how to use until in TypeScript:
Example 1: Print numbers from 1 to 10 using until
let i = 1;
until (i > 10) {
console.log(i);
i++;
}
Output:
1
2
3
4
5
6
7
8
9
10
Example 2: Generate a random number between 1 and 100 using until
let randomNumber = 0;
until (randomNumber > 0 && randomNumber <= 100) {
randomNumber = Math.floor(Math.random() * 100) + 1;
}
console.log(randomNumber);
Output:
[random number between 1 and 100]
In this example, the until loop keeps generating random numbers until it generates a number between 1 and 100.
It is worth noting that until is not a built-in keyword in TypeScript, but rather a logical extension of the language based on a third-party library. Therefore, when using until, it is important to make sure that the library is properly installed and configured in the project.