```
function
(length ds)
Returns the length or count of a data structure in constant time as
an integer. For structs and tables, returns the number of key-value
pairs in the data structure.
```

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```
(map length [ 'a :a "a" [97] @[97] {0 97} @{0 97} ])
# => @[ 1 1 1 1 1 1 1 ]
```