"how to find dublicates in string" Code Answer's
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how to find dublicates in string
const names = ['Mike', 'Matt', 'Nancy', 'Adam', 'Jenny', 'Nancy', 'Carl'];
const count = names =>
names.reduce((a, b) => {
a[b] = (a[b] || 0) + 1;
return a;
}, {}); // don't forget to initialize the accumulator
const duplicates = dict => Object.keys(dict).filter(a => dict[a] > 1);
console.log(count(names)); // { Mike: 1, Matt: 1, Nancy: 2, Adam: 1, Jenny: 1, Carl: 1 }
console.log(duplicates(count(names))); // [ 'Nancy' ]
Source: www.codegrepper.com
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