Groovy: Assignment vs if statement

An assignment statement is not allowed as a top-level expression in if statement.

For example,

HelloWorld.groovy

if(a = 10){
 println "a is evaluated to true"
}else{
 println "a is evaluated to false"
}

As you see above snippet, you may think if statement evaluates to true (Since non-zero numbers are considered as true in groovy), but Groovy do not allow top level assignment statements.

You can perform the trick like by embedding the expression in extra parenthesis.

HelloWorld.groovy

if((a = 10)){
 println "a is evaluated to true"
}else{
 println "a is evaluated to false"
}

Output

a is evaluated to true

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