JavaScript Random Strings, Random Number

function random_chars(length = 0) {
    let result = "";
    let chars = "1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
    for (var i = 0; i < length; i++) {
        result += chars[Math.floor(Math.random() * chars.length)];
    }
    return result;
}

function get_random_chars(length) {
    let result = random_chars(length);
    document.getElementById("random-char-text").innerText = result;
}

function random_numbers(length = 0) {
    let result = "";
    let chars = "1234567890";
    for (let i = 0; i < length; i++) {
        result += chars[Math.floor(Math.random() * chars.length)];
    }
    return result;
}

function get_random_number(length) {
    let result = random_numbers(length);
    document.getElementById("random-number-text").innerText = result;
}

function random_lowercase(length = 0) {
    let result = "";
    let chars = "abcdefghijklmnopqrstuvwxyz";
    for (var i = 0; i < length; i++) {
        result += chars[Math.floor(Math.random() * chars.length)];
    }
    return result;
}

function get_random_lowercase(length) {
    let result = random_lowercase(length);
    document.getElementById("random-lower-text").innerText = result;
}

function random_uppercase(length = 0) {
    let result = "";
    let chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    for (let i = 0; i < length; i++) {
        result += chars[Math.floor(Math.random() * chars.length)];
    }
    return result;
}

function get_random_uppercase(length) {
    let result = random_uppercase(length);
    document.getElementById("random-upper-text").innerText = result;
}

function number_between(min_number, max_number) {
    let min = Math.ceil(min_number);
    let max = Math.floor(max_number + 1);
    let result = Math.floor(Math.random() * (max - min)) + min;
    return result;
}

function get_number_between(min, max) {
    let result = number_between(min, max);
    document.getElementById("number-btwn-text").innerText = result;
}

function random_password(length = 8) {
    let result = "";
    let chars = "1234567890";
    chars += "abcdefghijklmnopqrstuvwxyz";
    chars += "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    chars += "~!@#$%^&*()_+}{></[]|-,:;'\".?";
    for (var i = 0; i < length; i++) {
        result += chars[Math.floor(Math.random() * chars.length)];
    }
    return result;
}

function get_random_password(length) {
    let result = random_password(length);
    document.getElementById("random-password").innerText = result;
}