I came across the concept of creating extension methods in Typescript and decided to explore some code on it.
https://i.sstatic.net/eFGXR.png
However, when I tried incorporating that code into my extension methods.ts file, I encountered an error stating that 'toNumber' does not exist. Can anyone provide guidance on how to resolve this issue?
To enhance the capabilities of the String interface, you can expand it by augmenting the global scope:
export { };
declare global {
interface String {
toNumber(): number;
}
}
String.prototype.toNumber = function (this: string) { return parseFloat(this) };
Check out this interactive Playground for implementation details.
One way to enhance the functionality of JavaScript's String interface is by adding a custom method, as shown below:
interface String {
toNumber(): number;
}
String.prototype.toNumber = function(this: string) {
return parseFloat(this);
}
const exampleString = '123.45';
exampleString.toNumber();
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