![]() ParseHub exposes 4 objects available in all expressions: To do this, use a loop node with $createArray(n) as the list to iterate over. This function is useful when you'd like to repeat something n times. This function takes in 1 parameter that specifies its size. The $createArray function creates a new array. The parseInt(parseFloat) function behaves exactly like the parseInt(parseFloat) javascript function. This is the position in the loop command. The tool also exposes $index as a hidden property. Expressions may reference these hidden scope properties. The loop command specifies the name of the iterator variable, this is defaulted to item. The iterator will be temporarily added to the scope, but will not be visible in the results (thus, hidden). The command allows you to iterate over a list. Remember, comparisons follow javascript semantics.Įxpressions can also reference hidden variables that are added to the scope from a loop. So the expression is comparing a number that is undefined, which evaluates to false. ![]() a in the scope evaluates to false because second is not in the current scope, and the current scope is the root scope.Some examples:Ī variable in an expression is evaluated in the current scope of the command where that expression is used. SyntaxĮxpressions use a subset of the javascript syntax. The conditional, extract, input, and loop commands primarily make use of expressions. For example, you can use a conditional command to execute its children only when an expression is truthy. Some nodes can use expressions to determine exactly how they manipulate a webpage. This is a relatively advanced tutorial! Without programming knowledge, you should stick to ParseHub's other tutorials.Ī ParseHub expression is similar to an expression in a programming language.
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