The built-in function length returns the length of a collection or string.
The length of a string is the number of bytes in the string. It is not necessarilly the number of characters. The length of a collection is the number of elements in that collection. The length of undefined is undefined.
Examples:
length("foo") // 3
length([1, 2, 3, 4]) // 4
length({ "key": "value" }) // 1
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