In my contract I have a map with a principal as its key and a tuple as its value. I want to get a particular value from the value-tuple for every principal in the map.
Let's say I want to get the salary for every member from the map below.
(define-map members principal {position: (string-ascii 30), salary: uint})
How to get a particular value from a map
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You can use Clarity's get
function in conjunction with map-get
:
Example:
(define-map members principal {position: (string-ascii 30), salary: uint})
(map-set members 'ST3QFME3CANQFQNR86TYVKQYCFT7QX4PRXM1V9W6H {position: "test", salary: u500})
(print (get salary (map-get? members 'ST3QFME3CANQFQNR86TYVKQYCFT7QX4PRXM1V9W6H)))
And a link to Clarity's get
function demonstrating this usage: https://docs.stacks.co/docs/write-smart-contracts/clarity-language/language-functions#get
However, you can't iterate through a map, you need to know the key to look up data, so if you wanted to iterate, you would need a list of all the principals and iterate through that using the map
function, looking up the corresponding principal in the map on each iteration.
You need to use
map-get
Check this examples
Or