[array_flip_9]

Description

Lazy way to reverse the order of key/value pairs in a pair array.

NOTE: This is a Lasso 9 port of Jason Huck's array_flip

http://tagswap.net/array_flip

Also included is a method that extends the Lasso 9 array type, adding ->flip as a member tag. Thanks to Jolle Carlestam for the inspiration :)

Sample Usage

var(unflipped = array( 
    'a' = 1, 
    'b' = 2, 
    'c' = 3 
	)
)
 
var(flipped = array_flip($unflipped)) 

'unflipped: '		+ $unflipped
'flipped: '		+ $flipped
'l9 method flipped: '	+ $flipped->flip &

Source Code

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define array_flip(in) => {
	// Returns the given pair array with the keys and values inverted.
    local(out = array) 
	with i in #in 
	where #i->isA('pair')
	do => { 
		#out->insert(#i->second = #i->first)
	}
	return #out
}

// OR

define array->flip() => {
	loop(.size) => {
		if(.get(loop_count)->isa('pair')) => {
			.get(loop_count) = pair(.get(loop_count)->second = .get(loop_count)->first)
		}
	}
}

Related Tags

• array_flip

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