function practice(param) {

    let minCharacters = param.match(/.{6,10}/g);
    let onlyLetters = param.match(/[A-Za-z\d]+/g);
    let atLeast2Digits = param.match(/\d/g);
    let isValid = true;

    if (!minCharacters) {
        console.log('Password must be between 6 and 10 characters');
        isValid = false;
    }
    if (onlyLetters == null || onlyLetters[0] !== param) {
        console.log('Password must consist only of letters and digits');
        isValid = false;
    }
    if (!atLeast2Digits || atLeast2Digits.length < 2) {
        console.log('Password must have at least 2 digits');
        isValid = false;
    }

    if (isValid) {
        console.log('Password is valid');
    }
}
practice('------')