Replace in TypeScript

To replace a substring within a string in TypeScript, you can use the replace() method. The replace() method returns a new string with some or all matches of a pattern replaced by a replacement.

Here is an example of how to replace a substring within a string in TypeScript:

let myString: string = "Hello World";
let newString: string = myString.replace("World", "Universe");
console.log(newString);  // Output: "Hello Universe"

In the above example, we have replaced the substring "World" in the myString variable with the substring "Universe" using the replace() method, and stored the result in the newString variable.

You can also use a regular expression to replace substrings within a string. Here is an example:

let myString: string = "Hello World 1, World 2, World 3";
let newString: string = myString.replace(/World/g, "Universe");
console.log(newString);  // Output: "Hello Universe 1, Universe 2, Universe 3"

In this example, we have replaced all occurrences of "World" in the myString variable with "Universe" using a regular expression with the 'g' flag, which matches all occurrences of the pattern rather than just the first one.