var-util.ts

export namespace VarUtil {
    export function is(variable: any, type: string): boolean {
        return typeOf(variable) === type;
    }

    export function typeOf(variable: any): string {
        const tag: string = Object.prototype.toString.call(variable);

        const match: string = tag.match(/(?<=\s)[\W\w]*(?=])/)[0];

        return match.toLowerCase();
    }

    export function isNumber(variable: any): boolean {
        return is(variable, "number");
    }

    export function isString(variable: any): boolean {
        return is(variable, "string");
    }

    export function isBoolean(variable: any): boolean {
        return is(variable, "boolean");
    }

    export function isObject(variable: any): boolean {
        return is(variable, "object");
    }

    export function isArray(variable: any): boolean {
        if (Array.isArray) {
            return Array.isArray(variable);
        }
        return is(variable, "array");
    }

    export function isFunction(variable: any): boolean {
        return is(variable, "function");
    }

    export function isSymbol(variable: any): boolean {
        return is(variable, "symbol");
    }

    export function isRegExp(variable: any): boolean {
        return is(variable, "regexp");
    }

    export function isDate(variable: any): boolean {
        return is(variable, "date");
    }

    export function isError(variable: any): boolean {
        return is(variable, "error");
    }

    export function isUndefined(variable: any): boolean {
        return is(variable, "undefined");
    }

    export function isNull(variable: any): boolean {
        return is(variable, "null");
    }
}