var wholeNumber = 0; var array = [ 5, 6, 2 ]; for(var dummyVariable = 0; dummyVariable < array.length-1; dummyVariable++){ array[dummyVariable] = power(10, array.length-dummyVariable-1) * array[dummyVariable]; // number, exponent wholeNumber+=array[dummyVariable]; } //Written And Tested In Pre-ES6 Javascript.