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In this guide, we will discuss Erlang all. Returns true if Pred(Elem) returns true for all elements Elem in List, otherwise false.

Syntax

all(Pred,lst)

Parameters

• Pred − The predicate function which will be applied to the string.
• Lst − The list of values.

Return Value

Returns true if Pred(Elem) returns true for all elements Elem in List, otherwise false.

For example

-module(helloworld). 
-import(lists,[all/2]). 
-export([start/0]). 

start() -> 
   Lst1 = [1,2,3], 
   Predicate = fun(E) -> E rem 2 == 0 end, 
   Status = all(Predicate, Lst1), 
   io:fwrite("~w~n",[Status]).

In the above example, we first define a predicate function in which each list value is passed to the anonymous function. In the function, each list value is seen if it is divisible by 2.

Output

When we run the above program, we will get the following result.

false

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