groovy
文字列の補間

構文

• $
• $ {}
• $ { - >}

ベーシック

def str = 'nice'
assert "Groovy is $str" == 'Groovy is nice'

点線の式

def arg = [phrase: 'interpolated']
assert "This is $arg.phrase" == 'This is interpolated'

熱心な表現

def str = 'old'
def interpolated = "I am the ${str} value"
assert interpolated == 'I am the old value'
str = 'new'
assert interpolated == 'I am the old value'

レイジー表現

私たちはStringで怠惰な補間をすることができます。 GStringは、Stringに変換されるたびに、クロージャに応じて異なる値を持つ可能性があるため、通常の補間とは異なります。

def str = 'old'
def interpolated = "I am the ${ -> str} value"
assert interpolated == 'I am the old value'
str = 'new'
assert interpolated == 'I am the new value'

式

def str = 'dsl'
def interpolated = "Groovy ${str.length() + 1} easy ${str.toUpperCase()}"
assert interpolated == 'Groovy 4 easy DSL'
str = 'Domain specific language'
assert interpolated == 'Groovy 4 easy DSL'