I have a string that looks like this
ATOM LEU 0.1234 C 0.123 0.32 0.34
How do I replace the C with .replace() to & in Javascript by getting only the location of C? The letter of C can essentially be anything.
I want
ATOM LEU 0.1234 & 0.123 0.32 0.34.
You can do it by using substring(),
var str = "ATOM LEU 0.1234 C 0.123 0.32 0.34";
var res = str.substring(0, 16) + "&" + str.substring(17);
console.log(str); //"ATOM LEU 0.1234 & 0.123 0.32 0.34"
var res = [str.substring(0, 16), str.substring(17)].join("&"). It's a subtle change, but it will run a lot faster if you need to process a lot of these at once. Also in your example, it should say console.log(res), right now it's just logging the original stringA come from? Also he wants to do it based off of location ("by getting only the location of C"). Which makes me think that the OP is not sure where in the string the substring they are trying to replace is. If you would like to replace all of them just call it in a loop until the substring is not longer present. If you don't need to know the location then just use the vanilla JavaScript replace().
You can also try this :
var str = "ATOM LEU 0.1234 C 0.123 0.32 0.34";
var strExp = str.split(" ");
var newStr = str.replace(strExp[3], "&");
console.log(newStr);
Find the location of the string you want to replace. Then replace it with what you want. I wrote this not knowing how long the string you want to replace will be.
var str = "ATOM LEU 0.1234 C 0.123 0.32 0.34";
var strToReplace = "C";
var indexOfStrToReplace = str.indexOf(strToReplace);
var result = str.substring(0,indexOfStrToReplace) + "&" + str.substing(indexOfC + strToReplace.length);
var str = "ATOM LEU 0.1234 C 0.123 0.32 0.34";
var newStr = str.replace(str.charAt(16), "&");
"ATOM LEU 0.1234 C 0.123 0.32 0.34".replace("C", "&")