[removed] replace last occurrence of text in a string

Question

See my code snippet below:

var list = [\'one\', \'two\', \'three\', \'four\'];
var str = \'one two, one three, one four, one\';
for ( var i = 0; i < list.         


        

Answer 1

I did not like any of the answers above and came up with the below

function replaceLastOccurrenceInString(input, find, replaceWith) {
    if (!input || !find || !replaceWith || !input.length || !find.length || !replaceWith.length) {
        // returns input on invalid arguments
        return input;
    }

    const lastIndex = input.lastIndexOf(find);
    if (lastIndex < 0) {
        return input;
    }

    return input.substr(0, lastIndex) + replaceWith + input.substr(lastIndex + find.length);
}

Usage:

const input = 'ten eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen twenty';
const find = 'teen';
const replaceWith = 'teenhundred';

const output = replaceLastOccurrenceInString(input, find, replaceWith);
console.log(output);

// output: ten eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteenhundred twenty

Hope that helps!