Groovy as a Scripting Language

GROOVY AS A SCRIPTING
LANGUAGE
Created by /
Jenn Strater @jennstrater

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WHAT'S GROOVY?
Groovy is a dynamic compiled language for the Java Virtual
Machine (JVM)

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HELLO WORLD
IN JAVA:
p
u
b
l
i
c c
l
a
s
s M
a
i
n
{
p
u
b
l
i
c s
t
a
t
i
c v
o
i
d m
a
i
n
(
S
t
r
i
n
g
[
] a
r
g
u
m
e
n
t
s
) {
S
y
s
t
e
m
.
o
u
t
.
p
r
i
n
t
l
n
(
"
H
e
l
l
o W
o
r
l
d
!
"
)
;
}
}
IN GROOVY:
p
r
i
n
t
l
n "
H
e
l
l
o
, W
o
r
l
d
!
"

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DATA TYPES
Strings
Functions
Collections
Lists
Maps

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STRINGS
Single Quotes
'
H
e
l
l
o
, w
o
r
l
d
!
'
Double Quotes -- GString
"
H
e
l
l
o
, $
n
a
m
e
"
Multi-line Strings
'
'
' T
h
i
s
i
s
a
m
u
l
t
i
-
l
i
n
e
s
t
r
i
n
g '
'
'

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STRING MANIPULATION
Split
d
e
f m
y
S
t
r
i
n
g = '
I <
3 G
r
o
o
v
y
'
m
y
S
t
r
i
n
g
.
t
o
k
e
n
i
z
e
(
'
<
3
'
)
-
-
> [
I
, G
r
o
o
v
y
]
Join
d
e
f m
y
L
i
s
t
O
f
S
t
r
i
n
g
s = [
'
I
'
,
'
<
3
'
,
'
G
r
o
o
v
y
'
]
m
y
L
i
s
t
O
f
S
t
r
i
n
g
s
.
j
o
i
n
(
' '
)
-
-
> I <
3 G
r
o
o
v
y

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CLOSURES
d
e
f a = { p
a
r
a
m
s -
> p
r
i
n
t
l
n (
p
a
r
a
m
s * 2 )
}
[
1
,
2
,
3
]
.
e
a
c
h a
-
-
> 2
-
-
> 4
-
-
> 6
a
(
1
)
-
-
> 2

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COLLECTIONS

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Lists
d
e
f m
y
L
i
s
t = [
'
a
'
,
'
b
'
,
2
]
m
y
L
i
s
t
.
m
u
l
t
i
p
l
y
(
2
)
-
-
> [
'
a
'
,
'
b
'
,
'
2
'
,
'
a
'
,
'
b
'
,
'
2
'
]

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SPECIAL FUNCTIONS
Spread Dot
m
y
L
i
s
t
*
.
m
u
l
t
i
p
l
y
(
2
)
-
-
> [
'
a
a
'
,
'
b
b
'
,
4
]

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MAPS
d
e
f m
y
M
a
p = [
v
a
l
1
: '
a
'
,
v
a
l
2
: '
b
'
, v
a
l
3
: '
b
'
]
m
y
M
a
p
.
v
a
l
u
e
s
(
)
-
-
> [
'
a
'
,
'
b
'
,
2
]
m
y
M
a
p
.
f
i
n
d { i
t
.
v
a
l
u
e =
= '
b
'
}
-
-
> v
a
l
2
=
b
m
y
M
a
p
.
f
i
n
d
A
l
l { i
t
.
v
a
l
u
e =
= '
b
' }
-
-
> [
v
a
l
2
:
b
, v
a
l
3
:
b
]

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LOOPS

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Each
d
e
f m
y
L
i
s
t = [
1
,
2
,
3
]
d
e
f r
e
s
u
l
t = [
]
m
y
L
i
s
t
.
e
a
c
h {
r
e
s
u
l
t <
< i
t * 2
}
p
r
i
n
t
l
n r
e
s
u
l
t
-
-
> [
2
,
4
,
6
]

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Collect
d
e
f m
y
L
i
s
t = [
1
,
2
,
3
]
d
e
f r
e
s
u
l
t = m
y
L
i
s
t
.
c
o
l
l
e
c
t { i
t
e
m -
>
i
t
e
m
.
m
u
l
t
i
p
l
y
(
2
)
}
p
r
i
n
t
l
n r
e
s
u
l
t
-
-
> [
2
,
4
,
6
]

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Ranges
(
1
.
.
3
)
.
e
a
c
h {
p
r
i
n
t
l
n i
t * 2
}
-
-
> 2
-
-
> 4
-
-
> 6

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FILE PROCESING

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CREATING & WRITING TO FILES
d
e
f m
y
F
i
l
e = n
e
w F
i
l
e
(
'
f
o
o
.
t
x
t
'
)
m
y
F
i
l
e
.
w
r
i
t
e '
h
e
l
l
o
, w
o
r
l
d
!
!
\
n
'
m
y
F
i
l
e
.
a
p
p
e
n
d
(
'
a
n
d h
e
l
l
o u
n
i
v
e
r
s
e
!
'
)

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READING FILES
d
e
f m
y
F
i
l
e = n
e
w F
i
l
e
(
'
f
o
o
.
t
x
t
'
)
m
y
F
i
l
e
.
e
a
c
h
L
i
n
e { l
i
n
e -
>
d
e
f p
r
o
c
e
s
s
e
d
L
i
n
e = l
i
n
e
.
r
e
p
l
a
c
e
A
l
l
(
'
h
e
l
l
o
'
,
'
h
i
'
)
p
r
i
n
t
l
n p
r
o
c
e
s
s
e
d
L
i
n
e
}
-
-
> h
i
, w
o
r
l
d
!
-
-
> a
n
d h
i u
n
i
v
e
r
s
e
!

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THINGS TO REMEMBER
Typing variables is optional
Some syntax is optional
semi-colons
parenthesis around function parameters
explicit return statements
The last operation completed is the default return value
There is more than one way to do almost everything!

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EXERCISES (HANDOUT)
RESOURCES
http://beta.groovy-lang.org/docs/groovy-
2.3.1/html/documentation/#_introduction
http://beta.groovy-lang.org/docs/latest/html/groovy-jdk/

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Groovy as a Scripting Language

Groovy as a Scripting Language

jlstrater

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