Can anyone help me to get the count of repeated characters in a given string in javascript.
For example,
"abccdef" -> 1 (Only "c" repeated)
"Indivisibilities" -> 2 ("i" and "s" repeated)
Thank You
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2 Answers
You can use like this
function getFrequency(string) {
var freq = {};
for (var i=0; i<string.length;i++) {
var character = string.charAt(i);
if (freq[character]) {
freq[character]++;
} else {
freq[character] = 1;
}
}
return freq;
};
getFrequency('Indivisibilities');
2 Comments
iAviator
we can add string.lowercase so that we get the character count with same character in either upper or lowercase
Fotios Tsakiris
This one is faster than the one of Amit Joki.
This is an interesting problem. What we can do is turn the string to lower case using String.toLowerCase, and then split on "", so we get an array of characters.
We will then sort it with Array.sort. After it has been sorted, we will join it using Array.join.
We can then make use of the regex /(.)\1+/g which essentially means match a letter and subsequent letters if it's the same.
When we use String.match with the stated regex, we will get an Array, whose length is the answer. Also used some try...catch to return 0 in case match returns null and results in TypeError.
function howManyRepeated(str){
try{ return str.toLowerCase().split("").sort().join("").match(/(.)\1+/g).length; }
catch(e){ return 0; } // if TypeError
}
console.log(howManyRepeated("Indivisibilities")); // 2
4 Comments
Naveen Krishna
Thanks for the answer. If I passed "abcdef", it should return 0, but it is showing an error message "TypeError: Cannot read property 'length' of null"
Amit Joki
@NaveenKrishna now it should work.
Naveen Krishna
Wow excellent man, it works! Simple and great answer.
Amit Joki
@NaveenKrishna glad to have helped you. I answered this because it was kinda interesting. It would be better on your part to post your try in the question. Any glad to have helped :)