export interface IUtil {
    each: (arr: Array<any>, isDomArray: boolean, callback: Function) => void;
    capitalizeFirstLetter: (string: string) => string;
    isNumber: (o: any) => boolean;
}

var util: IUtil = {
    each: each, 
    capitalizeFirstLetter: capitalizeFirstLetter,
    isNumber: isNumber
};

export { util };

function each(data: Array<any>, isDomArray: boolean, callback: Function) {
    for (let i = 0; i < data.length; i += 1) {
        if (isDomArray) {
            if (data[i] == 'input' || data[i] == 'textarea') {
                callback(data[i], 'focusout');
            } else {
                callback(data[i], 'click');
            }
        } else {
            callback(data[i]);
        }
    }
}

function capitalizeFirstLetter(string: string): string {
    return string.charAt(0).toUpperCase() + string.slice(1);
}

function isNumber(o) {
    return !isNaN(o - 0) && o !== null && o !== "" && o !== false;
}