I have this object in Javascript.
[{"col1": 1, "col2": 25},{"col1": 1, "col2": 25},{"col1": 3, "col2": 30}]
How can I drop duplicate records in order to get this result?
[{"col1": 1, "col2": 25},{"col1": 3, "col2": 30}]
I have tried next logic, but does not work:
[...new Set(myData)]
I recently read this on another answer and I liked it, this uses the optional argument of filter() that is passed as this inside the filter function.
const input = [
{"col1": 1, "col2": 25},
{"col1": 1, "col2": 25},
{"col1": 3, "col2": 30}
];
let res = input.filter(function({col1, col2})
{
return !this.has(`${col1}-${col2}`) && this.add(`${col1}-${col2}`)
}, new Set());
console.log(res);
fitler().const a = [{"col1": 1, "col2": 25},{"col1": 1, "col2": 25},{"col1": 3, "col2": 30}];
console.log(
a.reduce(
(acc, val) => !acc.some(({col1, col2}) => val.col1 === col1 && val.col2 === col2)
? acc.concat(val)
: acc,
[]
)
);
This answer shows a simple filter operation with a Set:
const data = [{"col1": 1, "col2": 25},{"col1": 1, "col2": 25},{"col1": 3, "col2": 30}];
const unique = data.filter(function({ col1, col2 }) { return !this.has(`${col1}-${col2}`) && this.add(`${col1}-${col2}`)}, new Set);
console.log(unique);
{"col1": 12, "col2": 3},{"col1": 1, "col2": 23},?