Custom AngularJS modules

twFilters.js

angular.module('twFilters', [])
.filter('unique', function () {
    return function (arr, field) {
        var o = {}, i, l = (arr) ? arr.length : 0, r = [];
        for (i = 0; i < l; i += 1) {
            o[arr[i][field]] = arr[i];
        }
        for (i in o) {
            r.push(o[i]);
        }
        return r;
    };
})
.filter('alphabetize', function () {
    return function (arr, field) {
        if (arr && typeof arr.sort === "function") {
            return arr.sort(function (a, b) {
                if (field)
                    return a[field].toString().localeCompare(b[field].toString());
                else
                    return a.toString().localeCompare(b.toString());
            });
        } else {
            //unsortable
            return arr;
        }
    };
})
.filter('join', function () {
    return function (arr, delim) {
        if (arr && typeof arr.join === "function") {
            return arr.join(delim)
        } else {
            //unjoinable
            return arr;
        }
    };
})
.filter('getprop', function () {
    return function (arr, field) {
        if (field && Array.isArray(arr) && typeof arr[0] === "object") {
            return arr.map(function (item) {
                if (item.hasOwnProperty(field))
                    return item[field];
                else
                    return item;
            });
        } else {
            // has no props. :(
            return arr;
        }
    };
});

twValidators.js

angular.module('twValidators', [])
.directive('integer', function () {
    return {
        require: 'ngModel',
        link: function (scope, elm, attrs, ctrl) {
            ctrl.$validators.integer = function (modelValue, viewValue) {
                //Empty controls are valid
                if (ctrl.$isEmpty(modelValue)) return true;
                // REGEX for integers
                return /^\-?\d+$/.test(viewValue);
            };
        }
    };
})
.directive('nChars', function () {
    return {
        require: 'ngModel',
        link: function (scope, elm, attrs, ctrl) {
            var numDigits = attrs.nChars;
            ctrl.$validators.nChars = function (modelValue, viewValue) {
                //Empty controls are valid
                if (ctrl.$isEmpty(modelValue)) return true;
                return viewValue.length == numDigits;
            };
        }
    };
})
.directive('decimal', function () {
    return {
        require: 'ngModel',
        link: function (scope, elm, attrs, ctrl) {
            ctrl.$validators.decimal = function (modelValue, viewValue) {
                //Empty controls are valid
                if (ctrl.$isEmpty(modelValue)) return true;
                return /^\d+\.\d+$/.test(viewValue);
            };
        }
    };
});