Question

How to replace the last occurrence of a substring in a string with TypeScript

Answer 1

function replaceLastOccurrence(s: string, subs: string, replace: string) {
    const pos: number = s.lastIndexOf(subs);

    if (pos === -1) {
        return s;
    }

    s = s.slice(0, pos) + replace + s.slice(pos + subs.length);
    
    return s;
}

const s: string = "typescript c++ c php c# typescript go typescript rust";

const result: string = replaceLastOccurrence(s, "typescript", "python");

console.log(result);

 
 
/*
run:
 
"typescript c++ c php c# typescript go python rust"
 
*/

 

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