. (full stop)

Gives access to the members of a structure.

Syntax

• S.x

  • S is a structure

  • x is a symbol, the name of a member of S

The returned value is an lvalue.

Description

If S is a structure and x the name of a member of S (as a symbol, not as a string), then S.x returns the value of this member in S.

S.x is an lvalue if S is; if so, S.x may be assigned to.

The . operator is implemented by the internal FCN_AccessMember function. This function is not exported with a name. Therefore, it can only be used via this operator.

Examples

Albus ≔ struct("FirstName": "Albus", "LastName": "Dumbledore", "Age": 105, "Role": "Headmaster")

FirstName: Albus
LastName: Dumbledore
Age: 105
Role: Headmaster

Albus.LastName

Dumbledore

Albus.Age ≔ 106

106

Albus

FirstName: Albus
LastName: Dumbledore
Age: 106
Role: Headmaster

now().date.year

2020

now().date.year ≔ 1995

failure

Left side cannot be assigned to.

Call stack: assign