Javascript replace char at index

replaceAt

function replaceAt(string, index, replace) {
  return string.substring(0, index) + replace + string.substring(index + 1);
}

Using your idea I did this to catch and replace hidden chars in text.

sampleData= '+ check if this has hidden chars';
// it does not if it did the + would be replaced by ERROR or something else
function ReplaceAt(string, index, replace) {

return string.substring(0, index) + replace + string.substring(index + 1);

}

function replaceX(STRG, OUT, IN) {
//20170329
try {
return STRG.split(OUT).join(IN);
}
catch (e) {
return "";
}
}

function detectFixHiddenChars(data) {

var chars = "";
var CK;
var KC;
for (k = 0; k < data.length; k++) {
    CK = data.charAt(k);
    KC = data.charCodeAt(k);
    if (KC < 32 || KC > 126) {
        data = ReplaceAt(data, k, '');
        data = replaceX(data, '+', 'Error ');//continue
    }
  return data
}

}

Thanks. I don't understand why using var[index] = value doesn't give the desired result when trying to alter characters in a string but doesn't throw an error either. That's strange

I still can't believe that this isn't automatically included in JS.

Useful, thanks!

I would be worth to have a replaceAll that makes use of replaceAt but with index update like (without RegExp of course)

text = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.\nLorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.\nLorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua."

replaceAll([{
		text: "Lorem",
		rep: "A",
		index: idx1
	},
	{
		text: "ipsum",
		rep: "B",
		index: idx2
	},
	{
		text: "eiusmod"
		rep: "C",
		index: idx3
	}
])

A B dolor sit amet, consectetur adipiscing elit, sed do C tempor incididunt ut labore et dolore magna aliqua.\nA B dolor sit amet, consectetur adipiscing elit, sed do C tempor incididunt ut labore et dolore magna aliqua.\nA B dolor sit amet, consectetur adipiscing elit, sed do C tempor incididunt ut labore et dolore magna aliqua