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Encoding string based on character frequency in JavaScript
Problem
We are required to write a JavaScript function that takes in a string, str, as the first and the only argument.
Our function should create a new string based on the input string where each character in the new string is '(' if that character appears only once in the original string, or ')' if that character appears more than once in the original string.
And we should ignore capitali
For example, if the input to the function is −
Input
const str = 'Success';
Output
const output = ')())())';
Example
Following is the code −
const str = 'Success';
const mapString = (str = '') => {
const mainStr = str.toLowerCase()
const hash = {}
let res = ''
for (let char of mainStr) {
hash[char] = ~~hash[char] + 1
}
for (let char of mainStr) {
if (hash[char] > 1) {
res += ')'
} else {
res += '('
}
}
return res
};
console.log(mapString(str));Output
)())())
Updated on: 22-Apr-2021
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