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Javascript groupby
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const dataGroupBy = (data:[], group_fields:string[], metric_field:string, method:string) => { | |
const agg_function:(arr:[], field:string) => number = ((arr, field) => { | |
switch(method){ | |
case 'sum': | |
return _.sumBy(arr, field) | |
case 'min': | |
return _.minBy(arr, field)[field] | |
case 'max': | |
return _.maxBy(arr, field)[field] | |
case 'avg': //wip | |
return _.sumBy(arr, field) / arr.length | |
case 'count': | |
return arr.length | |
} | |
}); | |
return _.chain(data).groupBy((i)=>group_fields.map(f=>i[f]).join('|')).map((v)=>({ | |
...Object.fromEntries(group_fields.map(field => [field, v[0][field]])), | |
[`${metric_field}_${method}`]:agg_function(v, metric_field)}) | |
).value() | |
} |
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Nécessite lodash.
Avec Object.groupBy, le code pourra être adapté en vanilla. Mais pour l'instant supporté seulement par des navigateurs récents (2023-10) : https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/groupBy