Is there a way to achieve similar functionality to String.Format in C# using TypeScript?
I'm thinking of creating a string like this:
url = "path/{0}/{1}/data.xml"
where I can substitute {0} and {1} based on the logic. While I can manually replace them, I believe having a function like String.Format would make it clearer.
Are you in search of the backquote character? ``
let myFirstName = 'Joe';
let myLastName = 'Smith';
console.log(`Hello ${myFirstName} ${myLastName}. Nice to meet you.`);You can usually locate the backquote on the tilde key. https://i.stack.imgur.com/EyU4M.jpg
function CustomStringFormat(inputString, ...arguments) {
return inputString.replace(/{(\d+)}/g, (match, index) => arguments[index] || '');
}
let result = CustomStringFormat("Hello {0}", "World!");
console.log(result); // Hello World!
result = CustomStringFormat("Hello {0} {1}", "beautiful", "World!");
console.log(result); // Hello beautiful World!
result = CustomStringFormat("Hello {0},{0}!", "beauty");
console.log(result); // Hello beauty,beauty!
result = CustomStringFormat("Hello {0},{0}!", "beauty", "World!");
console.log(result); // Hello beauty,beauty!
Try in TypeScript Playground
Building on my previous comment in response to vivekkurien, one effective method is to create a function that performs interpolation. I often use this technique to generate repetitive HTML elements with slight variations.
However, the solution provided by vivekkurien does not produce the desired outcome as it returns a static string. Below is an adjusted version of the original code snippet:
const pathFn = (param1, param2) => `path/${param1}/${param2}/data.xml`;
let param1 = "student";
let param2 = "contantdetails";
let resultPath = pathFn(param1, param2);
alert(resultPath);
You can test the updated code sample by visiting: Function-Based Interpolation at TypeScript Playground
In order to create a flexible path, it is essential to define a function that can take in 2 parameters. Once this function is called with the required parameters, it should return a string representing the path.
const generatePath = (param1, param2) => "path/${param1}/${param2}/data.xml";
let param1 = "student";
let param2 = "contantdetails";
let resultPath = generatePath(param1, param2);
After multiple attempts, I found success using this method and experimenting with various scenarios.
adjustFormat(text: string, ...args: string[]): string {
return text.replace(/{(\d+)}/g, (match, num) => {
return typeof args[num] !== 'undefined' ? args[num] : match;
});
}
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