Given the following array:
[
{
"real":104.1530776708426,
"workHour":8,
"value":null
},
{
"real":71.53948769310401,
"workHour":9
},
{
"real":97.84076993321577,
"workHour":10
},
{
"real":115.72564185649178,
"workHour":11
},
{
"real":79.95589800993977,
"workHour":12
},
{
"real":91.52846219558896,
"workHour":13
},
{
"real":57.86282092824589,
"workHour":14
},
{
"real":148.33923183423036,
"workHour":15
},
{
"real":125.19410346293202,
"workHour":16
},
{
"real":67.33128253468612,
"workHour":17
},
{
"real":55.75871834903695,
"workHour":18
},
{
"real":102.04897509163365,
"workHour":19
},
{
"real":132.55846249016332,
"workHour":20
},
{
"real":138.87077022779013,
"workHour":21
},
{
"real":60,
"workHour":8
},
{
"real":52,
"workHour":9
},
{
"real":114,
"workHour":10
},
{
"real":115,
"workHour":11
},
{
"real":92,
"workHour":12
},
{
"real":102,
"workHour":13
},
{
"real":54,
"workHour":14
},
{
"real":62,
"workHour":15
},
{
"real":133,
"workHour":16
},
{
"real":116,
"workHour":17
},
{
"real":106,
"workHour":18
},
{
"real":115,
"workHour":19
},
{
"real":115,
"workHour":20
},
{
"real":125,
"workHour":21
}
]
How can I find where the workHour
match, and combine real
there? I did it with pure JS
const array = [{"real":104.1530776708426,"workHour":8,"value":null},{"real":71.53948769310401,"workHour":9},{"real":97.84076993321577,"workHour":10},{"real":115.72564185649178,"workHour":11},{"real":79.95589800993977,"workHour":12},{"real":91.52846219558896,"workHour":13},{"real":57.86282092824589,"workHour":14},{"real":148.33923183423036,"workHour":15},{"real":125.19410346293202,"workHour":16},{"real":67.33128253468612,"workHour":17},{"real":55.75871834903695,"workHour":18},{"real":102.04897509163365,"workHour":19},{"real":132.55846249016332,"workHour":20},{"real":138.87077022779013,"workHour":21},{"real":60,"workHour":8},{"real":52,"workHour":9},{"real":114,"workHour":10},{"real":115,"workHour":11},{"real":92,"workHour":12},{"real":102,"workHour":13},{"real":54,"workHour":14},{"real":62,"workHour":15},{"real":133,"workHour":16},{"real":116,"workHour":17},{"real":106,"workHour":18},{"real":115,"workHour":19},{"real":115,"workHour":20},{"real":125,"workHour":21}]; var map = {}; for (var i=0; i<array.length; i++) { var obj = array[i], id = obj.workHour; if (id in map) { // we know this id already // get the object and sum properties map[id].real += obj.real; } else // create a new one map[id] = { workHour: id, real: obj.real, }; } console.log(map)
How can I do it with ES6? or Underscore?
Loop the array with Array#reduce
to create a new object with combined values:
var data = [{"real":104.1530776708426,"workHour":8,"value":null},{"real":71.53948769310401,"workHour":9},{"real":97.84076993321577,"workHour":10},{"real":115.72564185649178,"workHour":11},{"real":79.95589800993977,"workHour":12},{"real":91.52846219558896,"workHour":13},{"real":57.86282092824589,"workHour":14},{"real":148.33923183423036,"workHour":15},{"real":125.19410346293202,"workHour":16},{"real":67.33128253468612,"workHour":17},{"real":55.75871834903695,"workHour":18},{"real":102.04897509163365,"workHour":19},{"real":132.55846249016332,"workHour":20},{"real":138.87077022779013,"workHour":21},{"real":60,"workHour":8},{"real":52,"workHour":9},{"real":114,"workHour":10},{"real":115,"workHour":11},{"real":92,"workHour":12},{"real":102,"workHour":13},{"real":54,"workHour":14},{"real":62,"workHour":15},{"real":133,"workHour":16},{"real":116,"workHour":17},{"real":106,"workHour":18},{"real":115,"workHour":19},{"real":115,"workHour":20},{"real":125,"workHour":21}]; var result = data.reduce(function(r, o) { if (r[o.workHour]) { r[o.workHour].real += o.real } else { r[o.workHour] = { workHour: o.workHour, real: o.real } } return r; }, {}); console.log(result);
Using lodash(/underscore), this uses _.reduce()
with _.clone()
to build an aggregate object. The values of this object are then output as an array of objects similar to your input array using _.values()
.
var data = [{"real":104.1530776708426,"workHour":8,"value":null},{"real":71.53948769310401,"workHour":9},{"real":97.84076993321577,"workHour":10},{"real":115.72564185649178,"workHour":11},{"real":79.95589800993977,"workHour":12},{"real":91.52846219558896,"workHour":13},{"real":57.86282092824589,"workHour":14},{"real":148.33923183423036,"workHour":15},{"real":125.19410346293202,"workHour":16},{"real":67.33128253468612,"workHour":17},{"real":55.75871834903695,"workHour":18},{"real":102.04897509163365,"workHour":19},{"real":132.55846249016332,"workHour":20},{"real":138.87077022779013,"workHour":21},{"real":60,"workHour":8},{"real":52,"workHour":9},{"real":114,"workHour":10},{"real":115,"workHour":11},{"real":92,"workHour":12},{"real":102,"workHour":13},{"real":54,"workHour":14},{"real":62,"workHour":15},{"real":133,"workHour":16},{"real":116,"workHour":17},{"real":106,"workHour":18},{"real":115,"workHour":19},{"real":115,"workHour":20},{"real":125,"workHour":21}]; var result = _.values(_.reduce(data, (sumObj, curr) => { if (sumObj[curr.workHour]) sumObj[curr.workHour].real += curr.real; else sumObj[curr.workHour] = _.clone(curr); return sumObj; }, {})); console.log(result);
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