@function __base-every-iteratee($value, $index, $collection) {
    $predicate: __this('predicate');
    $result: if(__is-truthy(__exec($predicate, $value, $index, $collection)), true, false);
    $_: __this('result', $result);

    @return null;
}


@function __base-every($collection, $predicate) {
    $_: __scope((
        'result': true,
        'predicate': $predicate
    ));
    $_: __base-each($collection, '__base-every-iteratee');
    $result: __this('result');
    $_: __scope(false);

    @return if($result, true, false);
}


@function __list-every($list, $predicate) {
    $index: 1;
    $length: length($list);

    @while ($index <= $length) {
        $iteration: __exec($predicate, nth($list, $index), $index, $list);

        @if (not __is-truthy($iteration)) {
            @return false;
        }

        $index: $index + 1;
    }

    @return true;
}


@function __every($collection, $predicate: '__identity', $this-arg: $__undefined__) {
    $function: if(__is-list($collection), '__list-every', '__base-every');

    @if not __function-exists($predicate)
        or not __is-undefined($this-arg) {
        $predicate: __get-callback($predicate, $this-arg, 3);
    }

    @return __exec($function, $collection, $predicate);
}


/// Checks if `$predicate` returns truthy for **all** elements of `$collection`.
/// The predicate is bound to `$this-arg` and invoked with three arguments:
/// (value, index|key, collection).
/// 
/// If a property name is provided for `$predicate` the created `_property`
/// style callback returns the property value of the given element.
/// 
/// If a value is also provided for `$this-arg` the created `_matches-property`
/// style callback returns `true` for elements that have a matching property
/// value, else `false`.
/// 
/// If a map is provided for `$predicate` the created `_matches` style
/// callback returns `true` for elements that have the properties of the given
/// object, else `false`.
///
///
/// @access public
/// @group Collection
/// @param {List|Map|string} $collection The collection to iterate over.
/// @param {Function|Map|string} $predicate [_identity] - The function invoked
///  per iteration.
/// @param {*} $this-arg [null] - The `_this` binding of `$predicate`.
/// @returns {boolean} Returns `true` if all elements pass the predicate check,
///  else `false`.
/// @example scss
/// $foo: _every((true, 1, null, 'yes'), _is-boolean);
/// // => false
/// 
/// $users: (
///   ( 'user': 'barney', 'active': false ),
///   ( 'user': 'fred',   'active': false )
/// );
/// 
/// // using the `_matches` callback shorthand
/// $foo: _every($users, ( 'user': 'barney', 'active': false ));
/// // => false
/// 
/// // using the `_matches-property` callback shorthand
/// $foo: _every($users, 'active', false);
/// // => true
/// 
/// // using the `_property` callback shorthand
/// $foo: _every($users, 'active');
/// // => false

@function _every($args...) {
    @return call(get-function('__every'), $args...);
}

/// @alias _every

@function _all($args...) {
    @return call(get-function('__every'), $args...);
}
