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December 11, 2015 06:58
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Counting characters in a string for javascript
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| function charCount(str) { | |
| if (!str || typeof str !== 'string') { | |
| throw 'must provide a string'; | |
| } | |
| var letter, | |
| countObj = {}, | |
| alphabeticalLetters = [], | |
| outputString = '', | |
| letterCount; | |
| for (var i=0; i < str.length; ++i) { | |
| letter = str[i]; | |
| if (letter in countObj) { | |
| countObj[letter] += 1; | |
| } else { | |
| countObj[letter] = 1; | |
| alphabeticalLetters.push(letter); | |
| } | |
| } | |
| alphabeticalLetters.sort(); | |
| for (i = 0; i < alphabeticalLetters.length; ++i) { | |
| letter = alphabeticalLetters[i]; | |
| letterCount = countObj[letter]; | |
| if (letter === ' ') { | |
| outputString += "'" + letter + "'" + ':' + letterCount + ' '; | |
| } else { | |
| outputString += letter + ':' + letterCount + ' '; | |
| } | |
| } | |
| return outputString; | |
| } |
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To use with google spreadsheets go to Drive homepage, click Create -> More -> Script and paste the above contents. Then in a spreadsheet use by doing =charCount(A1) in a cell.