Here is the completed code for this problem. Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. Thanks
//required method
function balance(expression){
//a string variable to store balanced expression
var updated="";
//number of opened parentheses
var opened=0;
//looping through the expression
for (var i = 0; i < expression.length; i++) {
//getting current character
var c=expression.charAt(i);
//checking if it is an opening parentheses
if(c=='('){
//incrementing opened
opened+=1;
//adding c to updated
updated+=c;
}else if(c==')'){
//closing parentheses found, checking if there is an
//opening parentheses before
if(opened>0){
//only appending c to updated if there is an open parentheses before
updated+=c;
//decrementing number of opened parentheses
opened-=1;
}
}else{
//any other character, simply appending
updated+=c;
}
}
//now if there is any unclosed parentheses, closing all
//or in other words, appending 'opened' number of parentheses
while(opened>0){
//appending a ')'
updated+=")";
opened-=1;
}
return updated;
}
write an algorithm function called balance() in javascript that takes in a string and returns a...
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