Pangram checker

You are encouraged to solve this task according to the task description, using any language you may know.
A pangram is a sentence that contains all the letters of the English alphabet at least once.

For example:   The quick brown fox jumps over the lazy dog.



Task

Write a function or method to check a sentence to see if it is a   pangram   (or not)   and show its use.



Related tasks

   determine if a string has all the same characters
   determine if a string has all unique characters


chars: map 97..122 => [to :string to :char]
pangram?: function [sentence][
    every? chars 'ch ->
        in? ch sentence
]
 
print pangram? "this is a sentence"
print pangram? "The quick brown fox jumps over the lazy dog."