javascript if type of list code example

Example 1: type of javascript

//typeof() will return the type of value in its parameters.
//some examples of types: undefined, NaN, number, string, object, array

//example of a practical usage
if (typeof(value) !== "undefined") {//also, make sure that the type name is a string
  	//execute code
}

Example 2: typeof array

const array = [ 'this', 'is', 'an', 'array' ];
  console.log(typeof array); //object