ifpresent

.ifpresent value:{Dynamic} mapping:{Lambda} -> Any

Maps value to the result of mapping.

Note: this function is usually inlined. When inlining lambda arguments, an explicit @lambda annotation is required:

.name::ifpresent {@lambda x: .x::uppercase}::otherwise {unnamed}

As with any inlined lambda, @lambda can be omitted if the result is constant:

.name::ifpresent {I have a name}::otherwise {I'm unnamed}

the result of mapping executed on value if value is not none, none otherwise

value

value to check

mapping

lambda to execute if value is not none. It should accept one argument, which is value, and return a value.

This function is designed to be chained with other function calls:

Dynamic::ifpresent mapping:{Lambda} -> Any