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Constructing an object from repetitive numeral string in JavaScript
Suppose, we have a string with digits like this −
const str = '11222233344444445666';
We are required to write a JavaScript function that takes in this string and returns an object that represents the count of each number in the string.
So, for this string, the output should be −
const output = {
"1": 2,
"2": 4,
"3": 3,
"4": 7,
"5": 1,
"6": 3
};Therefore, let’s write the code for this function −
Example
The code for this will be −
const str = '11222233344444445666';
const mapString = str => {
const map = {};
for(let i = 0; i < str.length; i++){
map[str[i]] = (map[str[i]] || 0) + 1;
};
return map;
};
console.log(mapString(str));Output
The output in the console will be −
{ '1': 2, '2': 4, '3': 3, '4': 7, '5': 1, '6': 3 }
Updated on: 21-Oct-2020
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