Sum values inside an array - arrays

Question

I'm trying to sum the values inside an array depending on which levels they are but with no success for the moment.
Datas I'm working with ( named as the variable totalByLevel ) :
What I want :
Having each total per level inside 1 array, for example : ['total of 3 + 4', 'total of 6 + 7', etc...]
What I tried :
I tried to create an empty array and push the values from 3 + 4 into the array, which is working but not as intented.
Only the last values is kept in the array and all others are erased, if you have a fix for it I would really appreciate any help! Thank you in advance.
component.ts
for (const levelKey in this.totalByLevel ) {
if (this.totalByLevel .hasOwnProperty(levelKey)) {
const key = this.labelName[levelKey];
const value = this.totalByLevel [levelKey][Object.keys(this.totalByLevel [levelKey])[0]];
const value2 = this.labelName[Object.keys(this.totalByLevel [levelKey])[0]];
const value3 = this.totalByLevel [levelKey][Object.keys(this.totalByLevel [levelKey])[1]];
const value4 = this.totalByLevel [levelKey][Object.keys(this.totalByLevel [levelKey])[2]];
this.output_object[key] = value;
this.output_object2[key] = value2;
const sum = [];
if (value4 !== undefined || null) {
sum.push((+value + +value3 + +value4).toFixed(2));
console.log(sum, 'SUM 3');
this.totalPerCat = sum;
} else if (value4 === undefined || null) {
sum.push((+value + +value3).toFixed(2));
console.log(sum, 'SUM 2');
this.totalPerCat = sum;
} else if (value3 === undefined || null) {
sum.push(value);
console.log(sum, 'SUM 1');
this.totalPerCat = sum;
}
console.log(this.totalPerCat);
/* console.log(value3);
console.log(value4);
console.log(+value + +value3 + +value4, 'SUM');*/
}
}
});

Answer 1

Here you go:
const data={
2:{3:"3514.80", 4:"7259.32"},
5:{6:"864941.86", 7:"1076976.54"},
8:{"":"14145.69"},
9:{10:"223835.02", 11:"60978.31", 12:"5554.92"}
}
const result = Object.values(data).map(items => Object.values(items).map(val => Number(val)).reduce((a,b) => a + b, 0))
console.log(result)

Answer 2

You could use the funcitons Object.values() and Array reduce in combination. Try the following
var totalByLevel = {
2: {
3: '3514.80',
4: '7259.32'
},
5: {
6: '864941.86',
7: '1076976.54'
}
};
var sum = Object.values(totalByLevel).reduce((acc, curr) => {
acc.push(String(Object.values(curr).reduce((a, c) => a + Number(c), 0)));
return acc;
}, []);
console.log(sum);