I am trying to replace multiple characters in a single string but C character won't change to G, the rest works just fine.
String.prototype.allReplace = function(obj) {
var retStr = this;
for (var x in obj) {
retStr = retStr.replace(new RegExp(x, 'g'), obj[x]);
}
return retStr;
};
console.log('ACGTGGTCTTAA'.allReplace({'A' : 'U', 'C' : 'G', 'G' : 'C', 'T' : 'A'}));
// console.log is UCCACCACAAUU
You're doing global replaces within your input string at each step, so after you change every instance of C into a G, you then change every instance of G back into a C: later key/value pairs overwrite the results of earlier ones.
Instead, iterate through each character of your input individually:
String.prototype.allReplace = function(obj) {
var input = this;
var output = "";
for (var i = 0; i < input.length; i++) {
output = output + obj[input.charAt(i)];
}
return output;
}
console.log('ACGTGGTCTTAA'.allReplace({
'A': 'U',
'C': 'G',
'G': 'C',
'T': 'A'
}));
