# R For Loop

## For Loops

A `for` loop is used for iterating over a sequence:

### Example

for (x in 1:10) {
print(x)
}
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This is less like the `for` keyword in other programming languages, and works more like an iterator method as found in other object-orientated programming languages.

With the `for` loop we can execute a set of statements, once for each item in a vector, array, list, etc..

You will learn about lists and vectors, etc in a later chapter.

### Example

Print every item in a list:

fruits <- list("apple", "banana", "cherry")

for (x in fruits) {
print(x)
}
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### Example

Print the number of dices:

dice <- c(1, 2, 3, 4, 5, 6)

for (x in dice) {
print(x)
}
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The `for` loop does not require an indexing variable to set beforehand, like with `while` loops.

## Break

With the `break` statement, we can stop the loop before it has looped through all the items:

### Example

Stop the loop at "cherry":

fruits <- list("apple", "banana", "cherry")

for (x in fruits) {
if (x == "cherry") {
break
}
print(x)
}
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The loop will stop at "cherry" because we have chosen to finish the loop by using the `break` statement when `x` is equal to "cherry" (```x == "cherry"```).

## Next

With the `next` statement, we can skip an iteration without terminating the loop:

### Example

Skip "banana":

fruits <- list("apple", "banana", "cherry")

for (x in fruits) {
if (x == "banana") {
next
}
print(x)
}
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When the loop passes "banana", it will skip it and continue to loop.

## Yahtzee!

### If .. Else Combined with a For Loop

To demonstrate a practical example, let us say we play a game of Yahtzee!

### Example

Print "Yahtzee!" If the dice number is 6:

dice <- 1:6

for(x in dice) {
if (x == 6) {
print(paste("The dice number is", x, "Yahtzee!"))
} else {
print(paste("The dice number is", x, "Not Yahtzee"))
}
}
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If the loop reaches the values ranging from 1 to 5, it prints "No Yahtzee" and its number. When it reaches the value 6, it prints "Yahtzee!" and its number.

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