A function that checks the extension of a file

checkExtension.sh

#!/bin/bash

#   A function that checks the extension of a file
function checkExtension() {
    FILE="$1"
    EXTENSION="$2"
    if [[ "${FILE: -4}" == "${EXTENSION}" ]]
    then
        echo yes
        return 0
    else
        echo no
        return 1
    fi
}

export -f checkExtension