Reduce Multiple Objects into One
0
Let's say I have an array of objects:
[
{
category: 'Category A',
max: 10,
min: 12
},
{
category: 'Category B',
max: 2,
min: 1
},
{
category: 'Category C',
max: 4,
min: 4
}
]
However, I can't seem to get an array that looks like this:
{
category: 'Category ALL',
max: 16,
min: 17
}
All my attempts to make through reduce did not work.
javascript reduce
edited Nov 13 '18 at 1:18
Paulpro
112k15224230
asked Nov 12 '18 at 14:32
LuisDemn
22
add a comment |
0
Let's say I have an array of objects:
[
{
category: 'Category A',
max: 10,
min: 12
},
{
category: 'Category B',
max: 2,
min: 1
},
{
category: 'Category C',
max: 4,
min: 4
}
]
However, I can't seem to get an array that looks like this:
{
category: 'Category ALL',
max: 16,
min: 17
}
All my attempts to make through reduce did not work.
javascript reduce
edited Nov 13 '18 at 1:18
Paulpro
112k15224230
asked Nov 12 '18 at 14:32
LuisDemn
22
2
"... with success.", you say.
– ibrahim mahrir
Nov 12 '18 at 14:34
Is the issue in the fact you do not understand reduce, or are you getting errors?
– Dellirium
Nov 12 '18 at 14:35
Is there any algorithm behind that reduction? Or are the numbers and the category label drawn by random?
– Nico Haase
Nov 12 '18 at 14:36
@NicoHaase pretty sure its a simple sum
– Dellirium
Nov 12 '18 at 14:37
add a comment |
0
0
0
Let's say I have an array of objects:
[
{
category: 'Category A',
max: 10,
min: 12
},
{
category: 'Category B',
max: 2,
min: 1
},
{
category: 'Category C',
max: 4,
min: 4
}
]
However, I can't seem to get an array that looks like this:
{
category: 'Category ALL',
max: 16,
min: 17
}
All my attempts to make through reduce did not work.
javascript reduce
edited Nov 13 '18 at 1:18
Paulpro
112k15224230
asked Nov 12 '18 at 14:32
LuisDemn
22
Let's say I have an array of objects:
[
{
category: 'Category A',
max: 10,
min: 12
},
{
category: 'Category B',
max: 2,
min: 1
},
{
category: 'Category C',
max: 4,
min: 4
}
]
However, I can't seem to get an array that looks like this:
{
category: 'Category ALL',
max: 16,
min: 17
}
All my attempts to make through reduce did not work.
javascript reduce
javascript reduce
edited Nov 13 '18 at 1:18
Paulpro
112k15224230
asked Nov 12 '18 at 14:32
LuisDemn
22
edited Nov 13 '18 at 1:18
Paulpro
112k15224230
asked Nov 12 '18 at 14:32
LuisDemn
22
edited Nov 13 '18 at 1:18
Paulpro
112k15224230
edited Nov 13 '18 at 1:18
Paulpro
112k15224230
edited Nov 13 '18 at 1:18
Paulpro
112k15224230
112k15224230
asked Nov 12 '18 at 14:32
LuisDemn
22
asked Nov 12 '18 at 14:32
LuisDemn
22
asked Nov 12 '18 at 14:32
LuisDemn
22
22
2
"... with success.", you say.
– ibrahim mahrir
Nov 12 '18 at 14:34
Is the issue in the fact you do not understand reduce, or are you getting errors?
– Dellirium
Nov 12 '18 at 14:35
Is there any algorithm behind that reduction? Or are the numbers and the category label drawn by random?
– Nico Haase
Nov 12 '18 at 14:36
@NicoHaase pretty sure its a simple sum
– Dellirium
Nov 12 '18 at 14:37
add a comment |
2
"... with success.", you say.
– ibrahim mahrir
Nov 12 '18 at 14:34
Is the issue in the fact you do not understand reduce, or are you getting errors?
– Dellirium
Nov 12 '18 at 14:35
Is there any algorithm behind that reduction? Or are the numbers and the category label drawn by random?
– Nico Haase
Nov 12 '18 at 14:36
@NicoHaase pretty sure its a simple sum
– Dellirium
Nov 12 '18 at 14:37
2
2
"... with success.", you say.
– ibrahim mahrir
Nov 12 '18 at 14:34
"... with success.", you say.
– ibrahim mahrir
Nov 12 '18 at 14:34
Is the issue in the fact you do not understand reduce, or are you getting errors?
– Dellirium
Nov 12 '18 at 14:35
Is the issue in the fact you do not understand reduce, or are you getting errors?
– Dellirium
Nov 12 '18 at 14:35
Is there any algorithm behind that reduction? Or are the numbers and the category label drawn by random?
– Nico Haase
Nov 12 '18 at 14:36
Is there any algorithm behind that reduction? Or are the numbers and the category label drawn by random?
– Nico Haase
Nov 12 '18 at 14:36
@NicoHaase pretty sure its a simple sum
– Dellirium
Nov 12 '18 at 14:37
@NicoHaase pretty sure its a simple sum
– Dellirium
Nov 12 '18 at 14:37
add a comment |
4 Answers
4
active
oldest
votes
2
You could reduce the data by taking min and max as sum in an object for the next iteration.
var data = [{ category: 'Category A', max: 10, min: 12 }, { category: 'Category B', max: 2, min: 1 }, { category: 'Category C', max: 4, min: 4 }],
result = Object.assign(
{ category: 'Category All' },
data.reduce((a, b) => ({ min: a.min + b.min, max: a.max + b.max }))
);
console.log(result);A more dynamic approach by using an array for the keys.
var data = [{ category: 'Category A', max: 10, min: 12 }, { category: 'Category B', max: 2, min: 1 }, { category: 'Category C', max: 4, min: 4 }],
keys = ['min', 'max'],
result = Object.assign(
{ category: 'Category All' },
data.reduce((a, b) => Object.assign(...keys.map(k => ({ [k]: a[k] + b[k] }))))
);
console.log(result);answered Nov 12 '18 at 14:37
Nina Scholz
176k1390155
add a comment |
1
var array = [{
category: 'Category A',
max: 10,
min: 12
},
{
category: 'Category B',
max: 2,
min: 1
},
{
category: 'Category C',
max: 4,
min: 4
}
]
var result = array.reduce((a, v) => {
a.max += v.max
a.min += v.min
return a
}, {
category: "Category All",
max: 0,
min: 0
})
console.log(result).as-console-wrapper { max-height: 100% !important; top: 0; }answered Nov 12 '18 at 14:38
George
4,45711731
add a comment |
0
Just pass in the initial object { category: 'Category ALL', max: 0, min: 0 } to reduce, and for each item, just add its max and min to that object:
let result = array.reduce((acc, obj) => {
acc.max += obj.max;
acc.min += obj.min;
return acc;
}, { category: 'Category ALL', max: 0, min: 0 });
Example:
let array = [{ category: 'Category A', max: 10, min: 12 }, { category: 'Category B', max: 2, min: 1 }, { category: 'Category C', max: 4, min: 4 }];
let result = array.reduce((acc, obj) => {
acc.max += obj.max;
acc.min += obj.min;
return acc;
}, { category: 'Category ALL', max: 0, min: 0 });
console.log(result);answered Nov 12 '18 at 14:38
ibrahim mahrir
21.8k41847
add a comment |
0
You could use Array.reduce, so the array of objects can be reduced into a single object, and using es6 you can write in a single line.
Please see the below code,i hope it solves the issue
var res = [
{
category: 'Category A',
max: 10,
min: 12
},
{
category: 'Category B',
max: 2,
min: 1
},
{
category: 'Category C',
max: 4,
min: 4
}
]
var result = res.reduce((a,c) => ({category:"Category All", max: a.max + c.max, min: a.min + c.min}))
console.log("result", result)answered Nov 12 '18 at 14:46
DILEEP THOMAS
950513
add a comment |
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4 Answers
4
active
oldest
votes
4 Answers
4
active
oldest
votes
active
oldest
votes
active
oldest
votes
2
You could reduce the data by taking min and max as sum in an object for the next iteration.
var data = [{ category: 'Category A', max: 10, min: 12 }, { category: 'Category B', max: 2, min: 1 }, { category: 'Category C', max: 4, min: 4 }],
result = Object.assign(
{ category: 'Category All' },
data.reduce((a, b) => ({ min: a.min + b.min, max: a.max + b.max }))
);
console.log(result);A more dynamic approach by using an array for the keys.
var data = [{ category: 'Category A', max: 10, min: 12 }, { category: 'Category B', max: 2, min: 1 }, { category: 'Category C', max: 4, min: 4 }],
keys = ['min', 'max'],
result = Object.assign(
{ category: 'Category All' },
data.reduce((a, b) => Object.assign(...keys.map(k => ({ [k]: a[k] + b[k] }))))
);
console.log(result);answered Nov 12 '18 at 14:37
Nina Scholz
176k1390155
add a comment |
2
You could reduce the data by taking min and max as sum in an object for the next iteration.
var data = [{ category: 'Category A', max: 10, min: 12 }, { category: 'Category B', max: 2, min: 1 }, { category: 'Category C', max: 4, min: 4 }],
result = Object.assign(
{ category: 'Category All' },
data.reduce((a, b) => ({ min: a.min + b.min, max: a.max + b.max }))
);
console.log(result);A more dynamic approach by using an array for the keys.
var data = [{ category: 'Category A', max: 10, min: 12 }, { category: 'Category B', max: 2, min: 1 }, { category: 'Category C', max: 4, min: 4 }],
keys = ['min', 'max'],
result = Object.assign(
{ category: 'Category All' },
data.reduce((a, b) => Object.assign(...keys.map(k => ({ [k]: a[k] + b[k] }))))
);
console.log(result);answered Nov 12 '18 at 14:37
Nina Scholz
176k1390155
add a comment |
2
2
2
You could reduce the data by taking min and max as sum in an object for the next iteration.
var data = [{ category: 'Category A', max: 10, min: 12 }, { category: 'Category B', max: 2, min: 1 }, { category: 'Category C', max: 4, min: 4 }],
result = Object.assign(
{ category: 'Category All' },
data.reduce((a, b) => ({ min: a.min + b.min, max: a.max + b.max }))
);
console.log(result);A more dynamic approach by using an array for the keys.
var data = [{ category: 'Category A', max: 10, min: 12 }, { category: 'Category B', max: 2, min: 1 }, { category: 'Category C', max: 4, min: 4 }],
keys = ['min', 'max'],
result = Object.assign(
{ category: 'Category All' },
data.reduce((a, b) => Object.assign(...keys.map(k => ({ [k]: a[k] + b[k] }))))
);
console.log(result);answered Nov 12 '18 at 14:37
Nina Scholz
176k1390155
You could reduce the data by taking min and max as sum in an object for the next iteration.
var data = [{ category: 'Category A', max: 10, min: 12 }, { category: 'Category B', max: 2, min: 1 }, { category: 'Category C', max: 4, min: 4 }],
result = Object.assign(
{ category: 'Category All' },
data.reduce((a, b) => ({ min: a.min + b.min, max: a.max + b.max }))
);
console.log(result);A more dynamic approach by using an array for the keys.
var data = [{ category: 'Category A', max: 10, min: 12 }, { category: 'Category B', max: 2, min: 1 }, { category: 'Category C', max: 4, min: 4 }],
keys = ['min', 'max'],
result = Object.assign(
{ category: 'Category All' },
data.reduce((a, b) => Object.assign(...keys.map(k => ({ [k]: a[k] + b[k] }))))
);
console.log(result);var data = [{ category: 'Category A', max: 10, min: 12 }, { category: 'Category B', max: 2, min: 1 }, { category: 'Category C', max: 4, min: 4 }],
result = Object.assign(
{ category: 'Category All' },
data.reduce((a, b) => ({ min: a.min + b.min, max: a.max + b.max }))
);
console.log(result);var data = [{ category: 'Category A', max: 10, min: 12 }, { category: 'Category B', max: 2, min: 1 }, { category: 'Category C', max: 4, min: 4 }],
result = Object.assign(
{ category: 'Category All' },
data.reduce((a, b) => ({ min: a.min + b.min, max: a.max + b.max }))
);
console.log(result);var data = [{ category: 'Category A', max: 10, min: 12 }, { category: 'Category B', max: 2, min: 1 }, { category: 'Category C', max: 4, min: 4 }],
keys = ['min', 'max'],
result = Object.assign(
{ category: 'Category All' },
data.reduce((a, b) => Object.assign(...keys.map(k => ({ [k]: a[k] + b[k] }))))
);
console.log(result);var data = [{ category: 'Category A', max: 10, min: 12 }, { category: 'Category B', max: 2, min: 1 }, { category: 'Category C', max: 4, min: 4 }],
keys = ['min', 'max'],
result = Object.assign(
{ category: 'Category All' },
data.reduce((a, b) => Object.assign(...keys.map(k => ({ [k]: a[k] + b[k] }))))
);
console.log(result);answered Nov 12 '18 at 14:37
Nina Scholz
176k1390155
answered Nov 12 '18 at 14:37
Nina Scholz
176k1390155
answered Nov 12 '18 at 14:37
Nina Scholz
176k1390155
answered Nov 12 '18 at 14:37
Nina Scholz
176k1390155
176k1390155
add a comment |
add a comment |
1
var array = [{
category: 'Category A',
max: 10,
min: 12
},
{
category: 'Category B',
max: 2,
min: 1
},
{
category: 'Category C',
max: 4,
min: 4
}
]
var result = array.reduce((a, v) => {
a.max += v.max
a.min += v.min
return a
}, {
category: "Category All",
max: 0,
min: 0
})
console.log(result).as-console-wrapper { max-height: 100% !important; top: 0; }answered Nov 12 '18 at 14:38
George
4,45711731
add a comment |
1
var array = [{
category: 'Category A',
max: 10,
min: 12
},
{
category: 'Category B',
max: 2,
min: 1
},
{
category: 'Category C',
max: 4,
min: 4
}
]
var result = array.reduce((a, v) => {
a.max += v.max
a.min += v.min
return a
}, {
category: "Category All",
max: 0,
min: 0
})
console.log(result).as-console-wrapper { max-height: 100% !important; top: 0; }answered Nov 12 '18 at 14:38
George
4,45711731
add a comment |
1
1
1
var array = [{
category: 'Category A',
max: 10,
min: 12
},
{
category: 'Category B',
max: 2,
min: 1
},
{
category: 'Category C',
max: 4,
min: 4
}
]
var result = array.reduce((a, v) => {
a.max += v.max
a.min += v.min
return a
}, {
category: "Category All",
max: 0,
min: 0
})
console.log(result).as-console-wrapper { max-height: 100% !important; top: 0; }answered Nov 12 '18 at 14:38
George
4,45711731
var array = [{
category: 'Category A',
max: 10,
min: 12
},
{
category: 'Category B',
max: 2,
min: 1
},
{
category: 'Category C',
max: 4,
min: 4
}
]
var result = array.reduce((a, v) => {
a.max += v.max
a.min += v.min
return a
}, {
category: "Category All",
max: 0,
min: 0
})
console.log(result).as-console-wrapper { max-height: 100% !important; top: 0; }var array = [{
category: 'Category A',
max: 10,
min: 12
},
{
category: 'Category B',
max: 2,
min: 1
},
{
category: 'Category C',
max: 4,
min: 4
}
]
var result = array.reduce((a, v) => {
a.max += v.max
a.min += v.min
return a
}, {
category: "Category All",
max: 0,
min: 0
})
console.log(result).as-console-wrapper { max-height: 100% !important; top: 0; }var array = [{
category: 'Category A',
max: 10,
min: 12
},
{
category: 'Category B',
max: 2,
min: 1
},
{
category: 'Category C',
max: 4,
min: 4
}
]
var result = array.reduce((a, v) => {
a.max += v.max
a.min += v.min
return a
}, {
category: "Category All",
max: 0,
min: 0
})
console.log(result).as-console-wrapper { max-height: 100% !important; top: 0; }answered Nov 12 '18 at 14:38
George
4,45711731
answered Nov 12 '18 at 14:38
George
4,45711731
answered Nov 12 '18 at 14:38
George
4,45711731
answered Nov 12 '18 at 14:38
George
4,45711731
4,45711731
add a comment |
add a comment |
0
Just pass in the initial object { category: 'Category ALL', max: 0, min: 0 } to reduce, and for each item, just add its max and min to that object:
let result = array.reduce((acc, obj) => {
acc.max += obj.max;
acc.min += obj.min;
return acc;
}, { category: 'Category ALL', max: 0, min: 0 });
Example:
let array = [{ category: 'Category A', max: 10, min: 12 }, { category: 'Category B', max: 2, min: 1 }, { category: 'Category C', max: 4, min: 4 }];
let result = array.reduce((acc, obj) => {
acc.max += obj.max;
acc.min += obj.min;
return acc;
}, { category: 'Category ALL', max: 0, min: 0 });
console.log(result);answered Nov 12 '18 at 14:38
ibrahim mahrir
21.8k41847
add a comment |
0
Just pass in the initial object { category: 'Category ALL', max: 0, min: 0 } to reduce, and for each item, just add its max and min to that object:
let result = array.reduce((acc, obj) => {
acc.max += obj.max;
acc.min += obj.min;
return acc;
}, { category: 'Category ALL', max: 0, min: 0 });
Example:
let array = [{ category: 'Category A', max: 10, min: 12 }, { category: 'Category B', max: 2, min: 1 }, { category: 'Category C', max: 4, min: 4 }];
let result = array.reduce((acc, obj) => {
acc.max += obj.max;
acc.min += obj.min;
return acc;
}, { category: 'Category ALL', max: 0, min: 0 });
console.log(result);answered Nov 12 '18 at 14:38
ibrahim mahrir
21.8k41847
add a comment |
0
0
0
Just pass in the initial object { category: 'Category ALL', max: 0, min: 0 } to reduce, and for each item, just add its max and min to that object:
let result = array.reduce((acc, obj) => {
acc.max += obj.max;
acc.min += obj.min;
return acc;
}, { category: 'Category ALL', max: 0, min: 0 });
Example:
let array = [{ category: 'Category A', max: 10, min: 12 }, { category: 'Category B', max: 2, min: 1 }, { category: 'Category C', max: 4, min: 4 }];
let result = array.reduce((acc, obj) => {
acc.max += obj.max;
acc.min += obj.min;
return acc;
}, { category: 'Category ALL', max: 0, min: 0 });
console.log(result);answered Nov 12 '18 at 14:38
ibrahim mahrir
21.8k41847
Just pass in the initial object { category: 'Category ALL', max: 0, min: 0 } to reduce, and for each item, just add its max and min to that object:
let result = array.reduce((acc, obj) => {
acc.max += obj.max;
acc.min += obj.min;
return acc;
}, { category: 'Category ALL', max: 0, min: 0 });
Example:
let array = [{ category: 'Category A', max: 10, min: 12 }, { category: 'Category B', max: 2, min: 1 }, { category: 'Category C', max: 4, min: 4 }];
let result = array.reduce((acc, obj) => {
acc.max += obj.max;
acc.min += obj.min;
return acc;
}, { category: 'Category ALL', max: 0, min: 0 });
console.log(result);let array = [{ category: 'Category A', max: 10, min: 12 }, { category: 'Category B', max: 2, min: 1 }, { category: 'Category C', max: 4, min: 4 }];
let result = array.reduce((acc, obj) => {
acc.max += obj.max;
acc.min += obj.min;
return acc;
}, { category: 'Category ALL', max: 0, min: 0 });
console.log(result);let array = [{ category: 'Category A', max: 10, min: 12 }, { category: 'Category B', max: 2, min: 1 }, { category: 'Category C', max: 4, min: 4 }];
let result = array.reduce((acc, obj) => {
acc.max += obj.max;
acc.min += obj.min;
return acc;
}, { category: 'Category ALL', max: 0, min: 0 });
console.log(result);answered Nov 12 '18 at 14:38
ibrahim mahrir
21.8k41847
answered Nov 12 '18 at 14:38
ibrahim mahrir
21.8k41847
answered Nov 12 '18 at 14:38
ibrahim mahrir
21.8k41847
answered Nov 12 '18 at 14:38
ibrahim mahrir
21.8k41847
21.8k41847
add a comment |
add a comment |
0
You could use Array.reduce, so the array of objects can be reduced into a single object, and using es6 you can write in a single line.
Please see the below code,i hope it solves the issue
var res = [
{
category: 'Category A',
max: 10,
min: 12
},
{
category: 'Category B',
max: 2,
min: 1
},
{
category: 'Category C',
max: 4,
min: 4
}
]
var result = res.reduce((a,c) => ({category:"Category All", max: a.max + c.max, min: a.min + c.min}))
console.log("result", result)answered Nov 12 '18 at 14:46
DILEEP THOMAS
950513
add a comment |
0
You could use Array.reduce, so the array of objects can be reduced into a single object, and using es6 you can write in a single line.
Please see the below code,i hope it solves the issue
var res = [
{
category: 'Category A',
max: 10,
min: 12
},
{
category: 'Category B',
max: 2,
min: 1
},
{
category: 'Category C',
max: 4,
min: 4
}
]
var result = res.reduce((a,c) => ({category:"Category All", max: a.max + c.max, min: a.min + c.min}))
console.log("result", result)answered Nov 12 '18 at 14:46
DILEEP THOMAS
950513
add a comment |
0
0
0
You could use Array.reduce, so the array of objects can be reduced into a single object, and using es6 you can write in a single line.
Please see the below code,i hope it solves the issue
var res = [
{
category: 'Category A',
max: 10,
min: 12
},
{
category: 'Category B',
max: 2,
min: 1
},
{
category: 'Category C',
max: 4,
min: 4
}
]
var result = res.reduce((a,c) => ({category:"Category All", max: a.max + c.max, min: a.min + c.min}))
console.log("result", result)answered Nov 12 '18 at 14:46
DILEEP THOMAS
950513
You could use Array.reduce, so the array of objects can be reduced into a single object, and using es6 you can write in a single line.
Please see the below code,i hope it solves the issue
var res = [
{
category: 'Category A',
max: 10,
min: 12
},
{
category: 'Category B',
max: 2,
min: 1
},
{
category: 'Category C',
max: 4,
min: 4
}
]
var result = res.reduce((a,c) => ({category:"Category All", max: a.max + c.max, min: a.min + c.min}))
console.log("result", result)var res = [
{
category: 'Category A',
max: 10,
min: 12
},
{
category: 'Category B',
max: 2,
min: 1
},
{
category: 'Category C',
max: 4,
min: 4
}
]
var result = res.reduce((a,c) => ({category:"Category All", max: a.max + c.max, min: a.min + c.min}))
console.log("result", result)var res = [
{
category: 'Category A',
max: 10,
min: 12
},
{
category: 'Category B',
max: 2,
min: 1
},
{
category: 'Category C',
max: 4,
min: 4
}
]
var result = res.reduce((a,c) => ({category:"Category All", max: a.max + c.max, min: a.min + c.min}))
console.log("result", result)answered Nov 12 '18 at 14:46
DILEEP THOMAS
950513
answered Nov 12 '18 at 14:46
DILEEP THOMAS
950513
answered Nov 12 '18 at 14:46
DILEEP THOMAS
950513
answered Nov 12 '18 at 14:46
DILEEP THOMAS
950513
950513
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2
"... with success.", you say.
– ibrahim mahrir
Nov 12 '18 at 14:34
Is the issue in the fact you do not understand reduce, or are you getting errors?
– Dellirium
Nov 12 '18 at 14:35
Is there any algorithm behind that reduction? Or are the numbers and the category label drawn by random?
– Nico Haase
Nov 12 '18 at 14:36
@NicoHaase pretty sure its a simple sum
– Dellirium
Nov 12 '18 at 14:37