In Groovy, the for loop is used to execute a set of code repeatedly for a defined number of times or for each element in a collection.
Here are some examples to illustrate the use of for in Groovy:
1. Looping through a range of numbers:
for (i in 1..5) {
println(i)
}
1
2
3
4
5
for loop executes five times for each value of i between 1 and 5.
2. Looping through a collection:
def cities = ['New York', 'London', 'Paris']
for (city in cities) {
println(city)
}
Output:
New York
London
Paris
In this code,
for loop iterates through the cities list and prints each element.
3. Looping through key-value pairs of a Map:
def person = [name: "John", age: 30, city: "New York"]
for (entry in person) {
println("${entry.key} = ${entry.value}")
}
Output:
name = John
age = 30
city = New York
In this code,
for loop iterates through the person map and prints each key-value pair.
4. Looping with a step:
for (i in 0..10 step 2) {
println(i)
}
0
2
4
6
8
10
for loop iterates through the range from 0 to 10 with a step of 2, printing every second number.
These are just a few examples of how to use the for loop in Groovy. It's a powerful tool that can help you iterate through data efficiently and perform complex operations.