Is it possible to use similar function like String.Format of C# in TypeScript?
My idea is to make some string like:
url = "path/{0}/{1}/data.xml"
depending of the logical I set {0} and {1}. Obiouslly I can replace them but I think String.Format is a clear function.
I think you are looking for back quote: ``
var firstname = 'Fooo';
var lastname = 'Bar';
console.log(`Hi ${firstname} ${lastname}. Welcome.`);You can find the back quote on the tilde key.
const StringFormat = (str: string, ...args: string[]) =>
str.replace(/{(\d+)}/g, (match, index) => args[index] || '')
let res = StringFormat("Hello {0}", "World!")
console.log(res) // Hello World!
res = StringFormat("Hello {0} {1}", "beautiful", "World!")
console.log(res) // Hello beautiful World!
res = StringFormat("Hello {0},{0}!", "beauty")
console.log(res) //Hello beauty,beauty!
res = StringFormat("Hello {0},{0}!", "beauty", "World!")
console.log(res) //Hello beauty,beauty!
Try in TypeScript Playgroud
Expanding on the comment that I made on the response from vivekkurien, declaring a function which, in turn, interpolates is probably the largest "bang for your buck" approach. I use this, frequently, for generating chunks of repetitive HTML with minor varying properties, for example.
The answer from vivekkurien, however, does not work. It returns a literal string, instead. Here is a modified sample, based on the original answer:
const pathFn = (param1, param2) => `path/${param1}/${param2}/data.xml`;
let param1 = "student";
let param2 = "contantdetails";
let resultPath = pathFn(param1, param2);
alert(resultPath);
A runnable example of the above code can be found here: Function-Based Interpolation at TypeScript Playground
You need to make the path as a function which can accept 2 parameter. Then it will return as string if we call the function with required parameters.
const pathFn= (param1, param2) => "path/${param1}/${param2}/data.xml";
let param1 = "student";
let param2 = "contantdetails";
let resultPath = pathFn(param1,param2);
This worked for me. Tried with different scenarios.
format(text: string, ...args: string[]): string {
return text.replace(/{(\d+)}/g, (match, num) => {
return typeof args[num] !== 'undefined' ? args[num] : match;
});
}
