JavaScript String manipulation with JavaScript from the end of the string string manipulation with operators javascript,string manipulation with python,string

I've been having trouble trying to apply different JavaScript string manipulation solutions to my specific problem:

string str = ":2 E/4 :2 G/4 |:2 G/4 :2 F/4"

From the end of the string, I want to remove all the way up to the first : that is found.

1 removal:

":2 E/4 :2 G/4 |:2 G/4 "

2 removals:

":2 E/4 :2 G/4 |"

3 removals:

":2 E/4 "

How do I do this?

Answer:1

You can use lastindexof() to get the last occurance of ":" and then extract all the caracters before the position of that index using substring()

var str = ":2 E/4 :2 G/4 |:2 G/4 :2 F/4";
var n = str.lastIndexOf(":");
console.log(str.substring(0, n));
Answer:2

Try this.

<!DOCTYPE html>
<html>
<body>

<button onclick="myFunction(':2 E/4 :2 G/4 |:2 G/4 :2 F/4','2')">Click</button>
<script>
function myFunction(str,n) {
var x,y;
for (i = 0; i < n; i++) {     
    x=str.lastIndexOf(":");
    y=str.substr(0,str.lastIndexOf(":"));
str= y;
}
document.getElementById("demo").innerHTML =  y;
}
</script>

</body>
</html>
Answer:3

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