Execute line of code n times without initializing a variable
I'm new to swift. I want to add 100 random integers to an array. I have the following working code:
var integers = [Int]()
for i in 1...100 {
integers.append((Int.random(in: 0 ..< 100)))
}
The compiler warns me that I did not use i inside the scope of the for loop, which is indeed a sensible warning. Is there a way to do some line n times without declaring a variable which I won't use anyway?
swift
asked Nov 25 '18 at 15:15
K AbdulahiK Abdulahi
82
add a comment |
I'm new to swift. I want to add 100 random integers to an array. I have the following working code:
var integers = [Int]()
for i in 1...100 {
integers.append((Int.random(in: 0 ..< 100)))
}
The compiler warns me that I did not use i inside the scope of the for loop, which is indeed a sensible warning. Is there a way to do some line n times without declaring a variable which I won't use anyway?
swift
asked Nov 25 '18 at 15:15
K AbdulahiK Abdulahi
82
add a comment |
I'm new to swift. I want to add 100 random integers to an array. I have the following working code:
var integers = [Int]()
for i in 1...100 {
integers.append((Int.random(in: 0 ..< 100)))
}
The compiler warns me that I did not use i inside the scope of the for loop, which is indeed a sensible warning. Is there a way to do some line n times without declaring a variable which I won't use anyway?
swift
asked Nov 25 '18 at 15:15
K AbdulahiK Abdulahi
82
I'm new to swift. I want to add 100 random integers to an array. I have the following working code:
var integers = [Int]()
for i in 1...100 {
integers.append((Int.random(in: 0 ..< 100)))
}
The compiler warns me that I did not use i inside the scope of the for loop, which is indeed a sensible warning. Is there a way to do some line n times without declaring a variable which I won't use anyway?
swift
swift
asked Nov 25 '18 at 15:15
K AbdulahiK Abdulahi
82
asked Nov 25 '18 at 15:15
K AbdulahiK Abdulahi
82
asked Nov 25 '18 at 15:15
K AbdulahiK Abdulahi
82
asked Nov 25 '18 at 15:15
K AbdulahiK Abdulahi
82
asked Nov 25 '18 at 15:15
K AbdulahiK Abdulahi
82
82
add a comment |
add a comment |
3 Answers
3
active
oldest
votes
Change the i with _.
_ is just a way of saying that you don't need a variable here. It is known as the "wildcard pattern" in the swift documentation:
A wildcard pattern matches and ignores any value and consists of an
underscore (_). Use a wildcard pattern when you don’t care about the
values being matched against. For example, the following code iterates
through the closed range 1...3, ignoring the current value of the
range on each iteration of the loop:
for _ in 1...3 {
// Do something three times.
}
answered Nov 25 '18 at 15:19
SweeperSweeper
66.3k1073139
add a comment |
Change i to _. The use of the underscore is a way to tell the Swift compiler that you don't care about the variable or return value.
You can find this in the Swift book in the Control Flow chapter under For-In Loops.
answered Nov 25 '18 at 15:17
rmaddyrmaddy
241k27316380
add a comment |
You could do it like so:
let integers = (1...100).map { _ in Int.random(in: 0..<100) }
answered Nov 25 '18 at 15:21
Carpsen90Carpsen90
7,49762760
add a comment |
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
Change the i with _.
_ is just a way of saying that you don't need a variable here. It is known as the "wildcard pattern" in the swift documentation:
A wildcard pattern matches and ignores any value and consists of an
underscore (_). Use a wildcard pattern when you don’t care about the
values being matched against. For example, the following code iterates
through the closed range 1...3, ignoring the current value of the
range on each iteration of the loop:
for _ in 1...3 {
// Do something three times.
}
answered Nov 25 '18 at 15:19
SweeperSweeper
66.3k1073139
add a comment |
Change the i with _.
_ is just a way of saying that you don't need a variable here. It is known as the "wildcard pattern" in the swift documentation:
A wildcard pattern matches and ignores any value and consists of an
underscore (_). Use a wildcard pattern when you don’t care about the
values being matched against. For example, the following code iterates
through the closed range 1...3, ignoring the current value of the
range on each iteration of the loop:
for _ in 1...3 {
// Do something three times.
}
answered Nov 25 '18 at 15:19
SweeperSweeper
66.3k1073139
add a comment |
Change the i with _.
_ is just a way of saying that you don't need a variable here. It is known as the "wildcard pattern" in the swift documentation:
A wildcard pattern matches and ignores any value and consists of an
underscore (_). Use a wildcard pattern when you don’t care about the
values being matched against. For example, the following code iterates
through the closed range 1...3, ignoring the current value of the
range on each iteration of the loop:
for _ in 1...3 {
// Do something three times.
}
answered Nov 25 '18 at 15:19
SweeperSweeper
66.3k1073139
Change the i with _.
_ is just a way of saying that you don't need a variable here. It is known as the "wildcard pattern" in the swift documentation:
A wildcard pattern matches and ignores any value and consists of an
underscore (_). Use a wildcard pattern when you don’t care about the
values being matched against. For example, the following code iterates
through the closed range 1...3, ignoring the current value of the
range on each iteration of the loop:
for _ in 1...3 {
// Do something three times.
}
answered Nov 25 '18 at 15:19
SweeperSweeper
66.3k1073139
answered Nov 25 '18 at 15:19
SweeperSweeper
66.3k1073139
answered Nov 25 '18 at 15:19
SweeperSweeper
66.3k1073139
answered Nov 25 '18 at 15:19
SweeperSweeper
66.3k1073139
66.3k1073139
add a comment |
add a comment |
Change i to _. The use of the underscore is a way to tell the Swift compiler that you don't care about the variable or return value.
You can find this in the Swift book in the Control Flow chapter under For-In Loops.
answered Nov 25 '18 at 15:17
rmaddyrmaddy
241k27316380
add a comment |
Change i to _. The use of the underscore is a way to tell the Swift compiler that you don't care about the variable or return value.
You can find this in the Swift book in the Control Flow chapter under For-In Loops.
answered Nov 25 '18 at 15:17
rmaddyrmaddy
241k27316380
add a comment |
Change i to _. The use of the underscore is a way to tell the Swift compiler that you don't care about the variable or return value.
You can find this in the Swift book in the Control Flow chapter under For-In Loops.
answered Nov 25 '18 at 15:17
rmaddyrmaddy
241k27316380
Change i to _. The use of the underscore is a way to tell the Swift compiler that you don't care about the variable or return value.
You can find this in the Swift book in the Control Flow chapter under For-In Loops.
answered Nov 25 '18 at 15:17
rmaddyrmaddy
241k27316380
answered Nov 25 '18 at 15:17
rmaddyrmaddy
241k27316380
answered Nov 25 '18 at 15:17
rmaddyrmaddy
241k27316380
answered Nov 25 '18 at 15:17
rmaddyrmaddy
241k27316380
241k27316380
add a comment |
add a comment |
You could do it like so:
let integers = (1...100).map { _ in Int.random(in: 0..<100) }
answered Nov 25 '18 at 15:21
Carpsen90Carpsen90
7,49762760
add a comment |
You could do it like so:
let integers = (1...100).map { _ in Int.random(in: 0..<100) }
answered Nov 25 '18 at 15:21
Carpsen90Carpsen90
7,49762760
add a comment |
You could do it like so:
let integers = (1...100).map { _ in Int.random(in: 0..<100) }
answered Nov 25 '18 at 15:21
Carpsen90Carpsen90
7,49762760
You could do it like so:
let integers = (1...100).map { _ in Int.random(in: 0..<100) }
answered Nov 25 '18 at 15:21
Carpsen90Carpsen90
7,49762760
edited Nov 25 '18 at 15:34
answered Nov 25 '18 at 15:21
Carpsen90Carpsen90
7,49762760
answered Nov 25 '18 at 15:21
Carpsen90Carpsen90
7,49762760
answered Nov 25 '18 at 15:21
Carpsen90Carpsen90
7,49762760
7,49762760
add a comment |
add a comment |
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