How to call the function which has another function as parameter in scala?
Please advise how I can call the below function which has a function as one of the parameters.
def totalCostWithDiscountFunctionParameter(donutType: String)(quantity:
Int)(f: Double => Double): Double = {
println(s"Calculating total cost for $quantity $donutType")
val totalCost = 2.50 * quantity
f(totalCost)
}
scala
edited Nov 21 '18 at 22:15
jwvh
28.2k52141
asked Nov 21 '18 at 21:49
Balaji KrishnamoorthyBalaji Krishnamoorthy
12
add a comment |
Please advise how I can call the below function which has a function as one of the parameters.
def totalCostWithDiscountFunctionParameter(donutType: String)(quantity:
Int)(f: Double => Double): Double = {
println(s"Calculating total cost for $quantity $donutType")
val totalCost = 2.50 * quantity
f(totalCost)
}
scala
edited Nov 21 '18 at 22:15
jwvh
28.2k52141
asked Nov 21 '18 at 21:49
Balaji KrishnamoorthyBalaji Krishnamoorthy
12
totalCostWithDiscountFunctionParameter("Glazed")(4)(d => d*0.5)
– jwvh
Nov 21 '18 at 22:09
add a comment |
Please advise how I can call the below function which has a function as one of the parameters.
def totalCostWithDiscountFunctionParameter(donutType: String)(quantity:
Int)(f: Double => Double): Double = {
println(s"Calculating total cost for $quantity $donutType")
val totalCost = 2.50 * quantity
f(totalCost)
}
scala
edited Nov 21 '18 at 22:15
jwvh
28.2k52141
asked Nov 21 '18 at 21:49
Balaji KrishnamoorthyBalaji Krishnamoorthy
12
Please advise how I can call the below function which has a function as one of the parameters.
def totalCostWithDiscountFunctionParameter(donutType: String)(quantity:
Int)(f: Double => Double): Double = {
println(s"Calculating total cost for $quantity $donutType")
val totalCost = 2.50 * quantity
f(totalCost)
}
scala
scala
edited Nov 21 '18 at 22:15
jwvh
28.2k52141
asked Nov 21 '18 at 21:49
Balaji KrishnamoorthyBalaji Krishnamoorthy
12
edited Nov 21 '18 at 22:15
jwvh
28.2k52141
asked Nov 21 '18 at 21:49
Balaji KrishnamoorthyBalaji Krishnamoorthy
12
edited Nov 21 '18 at 22:15
jwvh
28.2k52141
edited Nov 21 '18 at 22:15
jwvh
28.2k52141
edited Nov 21 '18 at 22:15
jwvh
28.2k52141
28.2k52141
asked Nov 21 '18 at 21:49
Balaji KrishnamoorthyBalaji Krishnamoorthy
12
asked Nov 21 '18 at 21:49
Balaji KrishnamoorthyBalaji Krishnamoorthy
12
asked Nov 21 '18 at 21:49
Balaji KrishnamoorthyBalaji Krishnamoorthy
12
12
totalCostWithDiscountFunctionParameter("Glazed")(4)(d => d*0.5)
– jwvh
Nov 21 '18 at 22:09
add a comment |
totalCostWithDiscountFunctionParameter("Glazed")(4)(d => d*0.5)
– jwvh
Nov 21 '18 at 22:09
totalCostWithDiscountFunctionParameter("Glazed")(4)(d => d*0.5)– jwvh
Nov 21 '18 at 22:09
totalCostWithDiscountFunctionParameter("Glazed")(4)(d => d*0.5)– jwvh
Nov 21 '18 at 22:09
add a comment |
1 Answer
1
active
oldest
votes
First create a function:
val discountByTenPercent: Double => Double =
priceBeforeDiscount => 0.9 * priceBeforeDiscount
Then call the function which as a function as one of the parameters:
totalCostWithDiscountFunctionParameter("...")(5)(discountByTenPercent)
Of course, you can also create the function in the same line:
totalCostWithDiscountFunctionParameter("...")(5)(priceBeforeDiscount => 0.9 * priceBeforeDiscount)
If a parameter list only contains one argument that needs to be a function, you can also use braces instead of the parentheses:
totalCostWithDiscountFunctionParameter("...")(5) { priceBeforeDiscount =>
0.9 * priceBeforeDiscount
}
By the way, a "function which has another function as parameter" is called a "higher-order function".
answered Nov 21 '18 at 22:28
ToxarisToxaris
6,2331631
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
First create a function:
val discountByTenPercent: Double => Double =
priceBeforeDiscount => 0.9 * priceBeforeDiscount
Then call the function which as a function as one of the parameters:
totalCostWithDiscountFunctionParameter("...")(5)(discountByTenPercent)
Of course, you can also create the function in the same line:
totalCostWithDiscountFunctionParameter("...")(5)(priceBeforeDiscount => 0.9 * priceBeforeDiscount)
If a parameter list only contains one argument that needs to be a function, you can also use braces instead of the parentheses:
totalCostWithDiscountFunctionParameter("...")(5) { priceBeforeDiscount =>
0.9 * priceBeforeDiscount
}
By the way, a "function which has another function as parameter" is called a "higher-order function".
answered Nov 21 '18 at 22:28
ToxarisToxaris
6,2331631
add a comment |
First create a function:
val discountByTenPercent: Double => Double =
priceBeforeDiscount => 0.9 * priceBeforeDiscount
Then call the function which as a function as one of the parameters:
totalCostWithDiscountFunctionParameter("...")(5)(discountByTenPercent)
Of course, you can also create the function in the same line:
totalCostWithDiscountFunctionParameter("...")(5)(priceBeforeDiscount => 0.9 * priceBeforeDiscount)
If a parameter list only contains one argument that needs to be a function, you can also use braces instead of the parentheses:
totalCostWithDiscountFunctionParameter("...")(5) { priceBeforeDiscount =>
0.9 * priceBeforeDiscount
}
By the way, a "function which has another function as parameter" is called a "higher-order function".
answered Nov 21 '18 at 22:28
ToxarisToxaris
6,2331631
add a comment |
First create a function:
val discountByTenPercent: Double => Double =
priceBeforeDiscount => 0.9 * priceBeforeDiscount
Then call the function which as a function as one of the parameters:
totalCostWithDiscountFunctionParameter("...")(5)(discountByTenPercent)
Of course, you can also create the function in the same line:
totalCostWithDiscountFunctionParameter("...")(5)(priceBeforeDiscount => 0.9 * priceBeforeDiscount)
If a parameter list only contains one argument that needs to be a function, you can also use braces instead of the parentheses:
totalCostWithDiscountFunctionParameter("...")(5) { priceBeforeDiscount =>
0.9 * priceBeforeDiscount
}
By the way, a "function which has another function as parameter" is called a "higher-order function".
answered Nov 21 '18 at 22:28
ToxarisToxaris
6,2331631
First create a function:
val discountByTenPercent: Double => Double =
priceBeforeDiscount => 0.9 * priceBeforeDiscount
Then call the function which as a function as one of the parameters:
totalCostWithDiscountFunctionParameter("...")(5)(discountByTenPercent)
Of course, you can also create the function in the same line:
totalCostWithDiscountFunctionParameter("...")(5)(priceBeforeDiscount => 0.9 * priceBeforeDiscount)
If a parameter list only contains one argument that needs to be a function, you can also use braces instead of the parentheses:
totalCostWithDiscountFunctionParameter("...")(5) { priceBeforeDiscount =>
0.9 * priceBeforeDiscount
}
By the way, a "function which has another function as parameter" is called a "higher-order function".
answered Nov 21 '18 at 22:28
ToxarisToxaris
6,2331631
answered Nov 21 '18 at 22:28
ToxarisToxaris
6,2331631
answered Nov 21 '18 at 22:28
ToxarisToxaris
6,2331631
answered Nov 21 '18 at 22:28
ToxarisToxaris
6,2331631
6,2331631
add a comment |
add a comment |
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totalCostWithDiscountFunctionParameter("Glazed")(4)(d => d*0.5)– jwvh
Nov 21 '18 at 22:09