Boolean Type

A Boolean has a value of true or false.

while(true) {

   ...

}

All undefined values are treated as false Boolean values when used in the context of a condition. You can check whether a value is defined by using the value in an if/else condition. For example:

if(parameter['start_time']) {

   // action if 'start_time' is defined

   ...

else {

   // action if 'start_time' is not defined

   ...

}

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