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function totalLength(x: string, y: string): number
function totalLength(x: any[], y: any[]): number
function totalLength(x: (string | any[]), y: (string | any[])): number {
    var total: number = x.length + y.length;
    
    x.slice(0)
    
    if(x instanceof Array) {
        x.push('TypeScript')
    }
    
    if(x instanceof String) {
        x.substr(0)
    }
    
    return total;
}

totalLength()