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Blogger membership Operator

The membership operators are used to validate the membership of a value. These operators are used to find out whether a value is a member of a sequence. The result of operation returns a Boolean value.

List of Blogger Membership Operators

OperatorMeaningDefault syntax
inFound inOperand in [ARRAY]
Operand in ( EXPRESSION )
containsInclude[ARRAY] contains Operand
EXPRESSION contains operand
Functional SyntaxOperand operator ( Operand,Operand )
Operand operator ( Operand operator Operand )
Operand operator ( Operand operator ( Operand operator Operand ))

  • Member operators always return a Boolean value.
  • The Operand to be compared must be of the same type as the array, either String, Boolean or  Number.
  • The Operand to compare can be: An Blogger value, a dataset or the result of a Blogger Expression.
  • The operation can be nested in another operation that accepts operand type of boolean.
  • When ARRAY is a dataset of String, each must be wrapped with Double Quote: "STRING" and separeated by comma: "STRING","STRING".

Blogger Membership Operator Examples

OPERATOR "[IN]"

<b:eval expr='"Foo" in ["Foo","Bar","Baz"]'/>

The result of the operation will be: true since the string Foo is in the array.

OPERATOR "[CONTAINS]"

<b:eval expr='["Foo","Bar","Baz"] contains "Foo"'/>

The result will be: true since the array contains the string Foo. The result can be false if the dataset does not contain Foo.

OPERATOR "[CONTAINS]" WITH "[EXPRESSION]"

<b:if cond='data:post.body contains "Foo"'>

  <!-- item -->

</b:if>

The output will be displayed if a word "Foo" is found inside post body.

NESTING IN A LOGICAL OPERATION

<b:eval expr='data:posts.size in [7,20,50] and data:view.isMultipleItems'/>

The operation result will be true if the current page contains 7 or 20 or 50 posts and the current page is a multi-posts page.

NESTING IN A LAMBDA OPERATION

<b:eval expr='data:posts count (p => p.labels any (l => l.name contains "Foo"))'/>

The operation will count a total number of label name contains "Foo" in the current page view.

NESTING IN A TERNARY OPERATION

<b:eval expr='data:view.search.label in ["Foo","Bar"] ? "Welcome to Label Foo" : "Welcome to Label Bar"'/>

If current page view is Label page Foo, "Welcome to Label Foo" will be shown, and if the current label page is Bar, "Welcome to Label Bar" will be displayed.

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