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Second most frequent character in a string - JavaScript
We are required to write a JavaScript function that takes in a string and returns the character from the string that appears for second most number of times.
Let’s say the following is our string −
const str = 'This string will be used to calculate frequency';
Above, the second most frequent character is “e”.
Example
Let us now see the complete code −
const str = 'This string will be used to calculate frequency';
const secondMostFrequent = str => {
const strArr = str.split('');
const map = strArr.reduce((acc, val) => {
if(acc.has(val)){
acc.set(val, acc.get(val) + 1);
}else{
acc.set(val, 1);
};
return acc;
}, new Map);
const frequencyArray = Array.from(map);
return frequencyArray.sort((a, b) => {
return b[1] - a[1];
})[1][0];
};
console.log(secondMostFrequent(str));Output
This will produce the following output in console −
e
Updated on: 30-Sep-2020
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