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Count number of occurrences for each char in a string with JavaScript?
Take an array to store the frequency of each character. If similar character is found, then increment by one otherwise put 1 into that array.
Let’s say the following is our string −
var sentence = "My name is John Smith";
Following is the JavaScript code to count occurrences −
Example
var sentence = "My name is John Smith";
sentence=sentence.toLowerCase();
var noOfCountsOfEachCharacter = {};
var getCharacter, counter, actualLength, noOfCount;
for (counter = 0, actualLength = sentence.length; counter <
actualLength; ++counter) {
getCharacter = sentence.charAt(counter);
noOfCount = noOfCountsOfEachCharacter[getCharacter];
noOfCountsOfEachCharacter[getCharacter] = noOfCount ? noOfCount + 1: 1;
}
for (getCharacter in noOfCountsOfEachCharacter) {
if(getCharacter!=' ')
console.log("Character="+getCharacter + " Occurrences=" +
noOfCountsOfEachCharacter[getCharacter]);
}To run the above program, you need to use the following command −
node fileName.js.
Here, my file name is demo40.js.
Output
This will produce the following output −
PS C:\Users\Amit\JavaScript-code> node demo40.js Character=m Occurrences=3 Character=y Occurrences=1 Character=n Occurrences=2 Character=a Occurrences=1 Character=e Occurrences=1 Character=i Occurrences=2 Character=s Occurrences=2 Character=j Occurrences=1 Character=o Occurrences=1 Character=h Occurrences=2 Character=t Occurrences=1
Published on 01-Sep-2020 12:04:35
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