BasicList #? ZZ -- check for element in list

BasicList #? ZZ -- check for element in list

Synopsis:

Operator: #? -- check for presence of elements

Input:

an instance of class BasicList.

an instance of class ZZ.

Output:

an instance of class Boolean.

x#?i -- tells whether there is an i-th element in the list x.

i1 : {a,b,c} #? 2



o1 = true

i2 : {a,b,c} #? 22



o2 = false

See also:

BasicList # ZZ -- get element from list