Builtin Function: length

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