let x = [{'abc': 1, 'qwe':2},{'abc': 2, 'qwe':2},{'abc': 5, 'qwe':null}, {'abc': 4, 'qwe':null}],
let result = _.chain(x)
_.groupBy(qwe)
_.map((value, key) => ({
name: key,
data: _.map(_.filter(value, item => {
return item.qwe;
})
'qwe'
)
})).value()
})
output is:
qwe:[2,2,5]
Expected output is:
qwe:[2,2,5,0, 0]
If you're not specifically looking for "loadash", consider using the "map" method along with logical operators like "||" or "??".
let items = [{'abc': 1, 'qwe':2},{'abc': 2, 'qwe':2},{'abc': 5, 'qwe':null}, {'abc': 4, 'qwe':null}];
const getValue = (arr, key) => arr.map((item) => (item[key] || 0));
console.log(getValue(items, 'qwe'));To convert null values to a specific value (in this case 0), simply use the `||` operator while mapping.
let a = [
{ abc: 1, qwe: 2 },
{ abc: 2, qwe: 2 },
{ abc: 5, qwe: null },
{ abc: 4, qwe: null },
];
let res = _.chain(a)
.map("qwe")
.map((v) => v || 0)
.value();
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