how to count duplicates in an array javascript
var array = [1, 2, 2, 3, 3, 4, 5, 6, 2, 3, 7, 8, 5, 22, 1, 2, 511, 12, 50, 22];
console.log([...new Set(
array.filter((value, index, self) => self.indexOf(value) !== index))]
);
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const names = ['Mike', 'Matt', 'Nancy', 'Adam', 'Jenny', 'Nancy', 'Carl']
const count = names =>
names.reduce((a, b) => ({ ...a,
[b]: (a[b] || 0) + 1
}), {}) // 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' ]
Thank you!
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function getDuplicateArrayElements(arr){<br/> var sorted_arr = arr.slice().sort();<br/> var results = [];<br/> for (var i = 0; i < sorted_arr.length - 1; i++) {<br/> if (sorted_arr[i + 1] === sorted_arr[i]) {<br/> results.push(sorted_arr[i]);<br/> }<br/> }<br/> return results;<br/>}<br/><br/>var colors = ["red","orange","blue","green","red","blue"];<br/>var duplicateColors= getDuplicateArrayElements(colors);//["blue", "red"]
Thank you!
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[1, 2, 2, 4, 3, 4].filter((e, i, a) => a.indexOf(e) !== i) // [2, 4]
Thank you!
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arr.reduce((b,c)=>((b[b.findIndex(d=>d.el===c)]||b[b.push({el:c,count:0})-1]).count++,b),[]);
Thank you!
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var counts = {};
your_array.forEach(function(x) { counts[x] = (counts[x] || 0)+1; });
Thank you!
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