substract an element of an array after multiply two elements on the same array

I'm getting info from an api, and i multiply two elements from the response, and then, sum the result. This is my code so far:

function forTest(){

            $http.get('/api/DaApi?di=' + '2018-11-01' + '&df=' + '2018-11-01')

            .then(function(data){

                $scope.result = data.data.Response;



                $scope.multiplyResult = $scope.result.map(x => x.Cost * x.Quantity).reduce((a, b) => a + b, 0);

        }

Everything works perfect, but now i have to make another operation before the total sum. Let's say now i have 3 elements: Cost, Quantity and Discount:

[{Quantity: 2, Cost: 1000, Discount: -100},

{Quantity: 3, Cost: 2000, Discount: -500},

{Quantity: 2, Costo: 3130, Discount: -120}]

And now i need to multiply Quantity per Cost, and substract the Discount(which is already a negative number). After multiply and substract, i have to sum all the results. How can i make the substraction? Inside of map i have to make the subsraction? Something like:

$scope.multiplyResult = $scope.result.map(x => (x.Cost * x.Quantity) + x.Discount)).reduce((a, b) => a + b, 0);

Or must be inside of the reduce?

Someone can help me please, i'm a little far to understand the use of map and reduce. I'm using javascript and AngularJs.

Thanx in advance.

edited Nov 12 '18 at 22:50

georgeawg

32.9k104967

asked Nov 12 '18 at 22:23

Chuck Villavicencio

13110

2

Should work fine in the map() as shown. Are you getting unexpected results?
– charlietfl
Nov 12 '18 at 22:26

Did you run the code? What errors or issues did you encounter? This doesn't seem to have anything to do with Angular other than how you're getting the data. Note that x.Discount is possibly a string, so you'll want (...) + +x.Discount to coerce it to number first, otherwise you'll get concatenation.
– RobG
Nov 12 '18 at 22:28

Maybe you want Quantity * (Cost + Discount).
– georgeawg
Nov 12 '18 at 22:55

add a comment |

I'm getting info from an api, and i multiply two elements from the response, and then, sum the result. This is my code so far:

function forTest(){

            $http.get('/api/DaApi?di=' + '2018-11-01' + '&df=' + '2018-11-01')

            .then(function(data){

                $scope.result = data.data.Response;



                $scope.multiplyResult = $scope.result.map(x => x.Cost * x.Quantity).reduce((a, b) => a + b, 0);

        }

Everything works perfect, but now i have to make another operation before the total sum. Let's say now i have 3 elements: Cost, Quantity and Discount:

[{Quantity: 2, Cost: 1000, Discount: -100},

{Quantity: 3, Cost: 2000, Discount: -500},

{Quantity: 2, Costo: 3130, Discount: -120}]

$scope.multiplyResult = $scope.result.map(x => (x.Cost * x.Quantity) + x.Discount)).reduce((a, b) => a + b, 0);

Or must be inside of the reduce?

Someone can help me please, i'm a little far to understand the use of map and reduce. I'm using javascript and AngularJs.

Thanx in advance.

edited Nov 12 '18 at 22:50

georgeawg

32.9k104967

asked Nov 12 '18 at 22:23

Chuck Villavicencio

13110

2

Should work fine in the map() as shown. Are you getting unexpected results?
– charlietfl
Nov 12 '18 at 22:26

Did you run the code? What errors or issues did you encounter? This doesn't seem to have anything to do with Angular other than how you're getting the data. Note that x.Discount is possibly a string, so you'll want (...) + +x.Discount to coerce it to number first, otherwise you'll get concatenation.
– RobG
Nov 12 '18 at 22:28

Maybe you want Quantity * (Cost + Discount).
– georgeawg
Nov 12 '18 at 22:55

add a comment |

I'm getting info from an api, and i multiply two elements from the response, and then, sum the result. This is my code so far:

function forTest(){

            $http.get('/api/DaApi?di=' + '2018-11-01' + '&df=' + '2018-11-01')

            .then(function(data){

                $scope.result = data.data.Response;



                $scope.multiplyResult = $scope.result.map(x => x.Cost * x.Quantity).reduce((a, b) => a + b, 0);

        }

Everything works perfect, but now i have to make another operation before the total sum. Let's say now i have 3 elements: Cost, Quantity and Discount:

[{Quantity: 2, Cost: 1000, Discount: -100},

{Quantity: 3, Cost: 2000, Discount: -500},

{Quantity: 2, Costo: 3130, Discount: -120}]

$scope.multiplyResult = $scope.result.map(x => (x.Cost * x.Quantity) + x.Discount)).reduce((a, b) => a + b, 0);

Or must be inside of the reduce?

Someone can help me please, i'm a little far to understand the use of map and reduce. I'm using javascript and AngularJs.

Thanx in advance.

edited Nov 12 '18 at 22:50

georgeawg

32.9k104967

asked Nov 12 '18 at 22:23

Chuck Villavicencio

13110

I'm getting info from an api, and i multiply two elements from the response, and then, sum the result. This is my code so far:

function forTest(){

            $http.get('/api/DaApi?di=' + '2018-11-01' + '&df=' + '2018-11-01')

            .then(function(data){

                $scope.result = data.data.Response;



                $scope.multiplyResult = $scope.result.map(x => x.Cost * x.Quantity).reduce((a, b) => a + b, 0);

        }

Everything works perfect, but now i have to make another operation before the total sum. Let's say now i have 3 elements: Cost, Quantity and Discount:

[{Quantity: 2, Cost: 1000, Discount: -100},

{Quantity: 3, Cost: 2000, Discount: -500},

{Quantity: 2, Costo: 3130, Discount: -120}]

$scope.multiplyResult = $scope.result.map(x => (x.Cost * x.Quantity) + x.Discount)).reduce((a, b) => a + b, 0);

Or must be inside of the reduce?

Someone can help me please, i'm a little far to understand the use of map and reduce. I'm using javascript and AngularJs.

Thanx in advance.

javascript

edited Nov 12 '18 at 22:50

georgeawg

32.9k104967

asked Nov 12 '18 at 22:23

Chuck Villavicencio

13110

edited Nov 12 '18 at 22:50

georgeawg

32.9k104967

asked Nov 12 '18 at 22:23

Chuck Villavicencio

13110

edited Nov 12 '18 at 22:50

georgeawg

32.9k104967

edited Nov 12 '18 at 22:50

georgeawg

32.9k104967

edited Nov 12 '18 at 22:50

georgeawg

32.9k104967

asked Nov 12 '18 at 22:23

Chuck Villavicencio

13110

asked Nov 12 '18 at 22:23

Chuck Villavicencio

13110

asked Nov 12 '18 at 22:23

Chuck Villavicencio

13110

2

Should work fine in the map() as shown. Are you getting unexpected results?
– charlietfl
Nov 12 '18 at 22:26

Did you run the code? What errors or issues did you encounter? This doesn't seem to have anything to do with Angular other than how you're getting the data. Note that x.Discount is possibly a string, so you'll want (...) + +x.Discount to coerce it to number first, otherwise you'll get concatenation.
– RobG
Nov 12 '18 at 22:28

Maybe you want Quantity * (Cost + Discount).
– georgeawg
Nov 12 '18 at 22:55

add a comment |

2

Should work fine in the map() as shown. Are you getting unexpected results?
– charlietfl
Nov 12 '18 at 22:26

Did you run the code? What errors or issues did you encounter? This doesn't seem to have anything to do with Angular other than how you're getting the data. Note that x.Discount is possibly a string, so you'll want (...) + +x.Discount to coerce it to number first, otherwise you'll get concatenation.
– RobG
Nov 12 '18 at 22:28

Maybe you want Quantity * (Cost + Discount).
– georgeawg
Nov 12 '18 at 22:55

Should work fine in the map() as shown. Are you getting unexpected results?
– charlietfl
Nov 12 '18 at 22:26

Did you run the code? What errors or issues did you encounter? This doesn't seem to have anything to do with Angular other than how you're getting the data. Note that x.Discount is possibly a string, so you'll want (...) + +x.Discount to coerce it to number first, otherwise you'll get concatenation.
– RobG
Nov 12 '18 at 22:28

Maybe you want Quantity * (Cost + Discount).
– georgeawg
Nov 12 '18 at 22:55

add a comment |

2 Answers
2

active

oldest

votes

I think it was a typo.

let arr = [{Quantity: 2, Cost: 1000, Discount: -100},

{Quantity: 3, Cost: 2000, Discount: -500},

{Quantity: 2, Cost: 3130, Discount: -120}];



let sum = arr.map(x => (x.Cost * x.Quantity) + x.Discount).reduce((a,b)=>a+b,0)

console.log(sum);

answered Nov 12 '18 at 22:32

eag845

878611

add a comment |

You could calculate and sum in a single loop by taking a destructuring assignment for the needed properties and then add to sum the price.

$scope.multiplyResult = $scope.result

    .reduce((sum, { Cost, Quantity, Discount }) => sum + Cost * Quantity + Discount, 0);

answered Nov 12 '18 at 22:30

Nina Scholz

178k1491156

add a comment |

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

I think it was a typo.

let arr = [{Quantity: 2, Cost: 1000, Discount: -100},

{Quantity: 3, Cost: 2000, Discount: -500},

{Quantity: 2, Cost: 3130, Discount: -120}];



let sum = arr.map(x => (x.Cost * x.Quantity) + x.Discount).reduce((a,b)=>a+b,0)

console.log(sum);

answered Nov 12 '18 at 22:32

eag845

878611

add a comment |

I think it was a typo.

let arr = [{Quantity: 2, Cost: 1000, Discount: -100},

{Quantity: 3, Cost: 2000, Discount: -500},

{Quantity: 2, Cost: 3130, Discount: -120}];



let sum = arr.map(x => (x.Cost * x.Quantity) + x.Discount).reduce((a,b)=>a+b,0)

console.log(sum);

answered Nov 12 '18 at 22:32

eag845

878611

add a comment |

I think it was a typo.

let arr = [{Quantity: 2, Cost: 1000, Discount: -100},

{Quantity: 3, Cost: 2000, Discount: -500},

{Quantity: 2, Cost: 3130, Discount: -120}];



let sum = arr.map(x => (x.Cost * x.Quantity) + x.Discount).reduce((a,b)=>a+b,0)

console.log(sum);

answered Nov 12 '18 at 22:32

eag845

878611

I think it was a typo.

let arr = [{Quantity: 2, Cost: 1000, Discount: -100},

{Quantity: 3, Cost: 2000, Discount: -500},

{Quantity: 2, Cost: 3130, Discount: -120}];



let sum = arr.map(x => (x.Cost * x.Quantity) + x.Discount).reduce((a,b)=>a+b,0)

console.log(sum);

let arr = [{Quantity: 2, Cost: 1000, Discount: -100},

{Quantity: 3, Cost: 2000, Discount: -500},

{Quantity: 2, Cost: 3130, Discount: -120}];



let sum = arr.map(x => (x.Cost * x.Quantity) + x.Discount).reduce((a,b)=>a+b,0)

console.log(sum);

let arr = [{Quantity: 2, Cost: 1000, Discount: -100},

{Quantity: 3, Cost: 2000, Discount: -500},

{Quantity: 2, Cost: 3130, Discount: -120}];



let sum = arr.map(x => (x.Cost * x.Quantity) + x.Discount).reduce((a,b)=>a+b,0)

console.log(sum);

answered Nov 12 '18 at 22:32

eag845

878611

answered Nov 12 '18 at 22:32

eag845

878611

answered Nov 12 '18 at 22:32

eag845

878611

answered Nov 12 '18 at 22:32

eag845

878611

add a comment |

You could calculate and sum in a single loop by taking a destructuring assignment for the needed properties and then add to sum the price.

$scope.multiplyResult = $scope.result

    .reduce((sum, { Cost, Quantity, Discount }) => sum + Cost * Quantity + Discount, 0);

answered Nov 12 '18 at 22:30

Nina Scholz

178k1491156

add a comment |

You could calculate and sum in a single loop by taking a destructuring assignment for the needed properties and then add to sum the price.

$scope.multiplyResult = $scope.result

    .reduce((sum, { Cost, Quantity, Discount }) => sum + Cost * Quantity + Discount, 0);

answered Nov 12 '18 at 22:30

Nina Scholz

178k1491156

add a comment |

You could calculate and sum in a single loop by taking a destructuring assignment for the needed properties and then add to sum the price.

$scope.multiplyResult = $scope.result

    .reduce((sum, { Cost, Quantity, Discount }) => sum + Cost * Quantity + Discount, 0);

answered Nov 12 '18 at 22:30

Nina Scholz

178k1491156

You could calculate and sum in a single loop by taking a destructuring assignment for the needed properties and then add to sum the price.

$scope.multiplyResult = $scope.result

    .reduce((sum, { Cost, Quantity, Discount }) => sum + Cost * Quantity + Discount, 0);

answered Nov 12 '18 at 22:30

Nina Scholz

178k1491156

answered Nov 12 '18 at 22:30

Nina Scholz

178k1491156

answered Nov 12 '18 at 22:30

Nina Scholz

178k1491156

answered Nov 12 '18 at 22:30

Nina Scholz

178k1491156

add a comment |

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