Deletes an expression from a list.

Synopsis

• lvarpop var ?indexExpr? ?string?

Description

The lvarpop command pops (deletes) the element indexed by the expression indexExpr from the list contained in the variable var. If index is omit- ted, then 0 is assumed. If string, is specified, then the deleted element is replaced by string. The replaced or deleted element is returned. Thus "lvarpop argv 0" returns the first element of argv, setting argv to contain the remainder of the string.

If the expression indexExpr starts with the string end, then end is replaced with the index of the last element in the list. If the expression starts with len, then len is replaced with the length of the list.