I have an array object:
const data = [
{ label: 'P', value: 13 },
{ label: 'P', value: 7 },
{ label: 'Q', value: 15 },
{ label: 'Q', value: 8 },
{ label: 'Q', value: 1 },
{ label: 'R', value: 5 },
{ label: 'S', value: 6 }
]
I need to produce an object which keeps the sum of the value for each key. So,the output will be:
{P: 20, Q: 24, R: 5, S: 6}
I am struggling to generate the output.
const data = [
{ label: 'P', value: 13 },
{ label: 'P', value: 7 },
{ label: 'Q', value: 15 },
{ label: 'Q', value: 8 },
{ label: 'Q', value: 1 },
{ label: 'R', value: 5 },
{ label: 'S', value: 6 }
]
const customData = data.reduce((acc, cur) => {
let common = acc.length > 0 && acc.filter(item => item.label === cur.label)
if (common) {
common.value += cur.value
} else {
}
return acc
}, {})
console.log(customData)
// expected output {P: 20, Q: 24, R: 5, S: 6}Check to see if the key exists. If it doesn't set it to zero, and add the value to it. Otherwise add the value.
const data = [
{ label: 'P', value: 13 },
{ label: 'P', value: 7 },
{ label: 'Q', value: 15 },
{ label: 'Q', value: 8 },
{ label: 'Q', value: 1 },
{ label: 'R', value: 5 },
{ label: 'S', value: 6 }
]
const customData = data.reduce((acc, cur) => {
// Destructure the label and value from the object
const { label, value } = cur;
// If the label isn't present as a key on
// the accumulator, set its value to zero, and then
// add the value from the current object,
// otherwise just add the value.
acc[label] = (acc[label] || 0) + value;
return acc;
}, {})
console.log(customData);create data json to parse, add the symbolic data into an array for find what you wanted. add (like you want) += to a number array at position 1 when the position 0 was expected in the same name...
const dataParse = `{ "data" : [
{ "label": "P", "value": 13},
{ "label": "P", "value": 7 },
{ "label": "Q", "value": 15},
{ "label": "Q", "value": 8 },
{ "label": "Q", "value": 1 },
{ "label": "R", "value": 5 },
{ "label": "S", "value": 6 }
]}`;
var unique = [];
var data = JSON.parse(dataParse);
unique.push([data.data[0].label])
unique[0].push(data.data[0].value)
for (a = 1; a < data.data.length; a++) {
for (a2 = 0; a2 < unique.length; a2++) {
if (unique[a2][0] == data.data[a].label && a2 != a) {
unique[a2][1] += data.data[a].value;
break;
}
if (a2 == unique.length-1) {
unique.push([data.data[a].label, data.data[a].value])
break;
}
}
}
for (b = 0; b < unique.length; b++) {
console.log(unique[b][1]);
}
unique[0] give the name and [1] give solution