Is it possible to log function(cities) return value to console in JavaScript for testing whether the-CodePudding

I am busy with a challenge and I know the code is correct as it passes the assignment but I'm having a tough time testing the out put.

<code>
function nonMutatingSplice(cities) {
  // Only change code below this line
  return cities.slice(0, 3);

  

  // Only change code above this line
}

console.log(cities)

const inputCities = ["Chicago", "Delhi", "Islamabad"]
nonMutatingSplice(inputCities); 

</code>

When I initiate the console log() call, the output to the console returns "ReferenceError: cities is not defined"

How can I console log the return value of the function to return the correct mutated array's values?

I am expecting to see the following in the console to validate that the code is returning the correct output:

["Chicago", "Delhi", "Islamabad"]

CodePudding user response：

You need to log the output from nonMutatingSplice

cities is never defined, because you don't allocate a value to the variable.

You can do it by using the following code.

const cities = nonMutatingSplice(inputCities);

Here's the code with a working output.

function nonMutatingSplice(cities) {
  return cities.slice(0, 3);
}

const inputCities = ["Chicago", "Delhi", "Islamabad"]
console.log(nonMutatingSplice(inputCities))

non-mutable example:

function nonMutatingSplice(cities) {
  return cities.slice(0, 2);
}

const inputCities = ["Chicago", "Delhi", "Islamabad"]
const cities = nonMutatingSplice(inputCities);
console.log(cities) //[ 'Chicago', 'Delhi' ]
console.log(inputCities) //[ 'Chicago', 'Delhi', 'Islamabad' ]