Learn Advanced Array Methods by Building a Statistics Calculator - Step 4

JavaScript
1

g-a-statistics-calculator/step-4

I’ve tried about 6 different variations for the task: Create a numbers variable and assign it the value of array.map(). But I still get: You should use the .map() method on your array variable.

WHERE AND WHAT AM I DOING WRONG?

  1. Using an anonymous arrow function:

const numbers = array.map((element) => Number(element));

  1. Using an explicit return statement with an anonymous arrow function:

const numbers = array.map((element) => {
return Number(element);
});

  1. Using the implicit return feature of arrow functions with parentheses around the argument:

const numbers = array.map((element) => (Number(element)));

  1. Using the traditional function keyword:

const numbers = array.map(function (element) {
return Number(element);
});

  1. Using the Function.prototype.call() method to invoke the .map() method with a defined function:

const numbers = Array.prototype.map.call(array, function (element) {
return Number(element);
});

  1. Using a combination of .bind() and .call() methods to invoke the .map() method with a predefined function:

const mapNumbers = function (array) {
return Array.prototype.map.call(array, Number);
}.bind(null, array);

const numbers = mapNumbers();

2

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Post a link to the challenge.

3

https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures-v8/learn-advanced-array-methods-by-building-a-statistics-calculator/step-4

4

Read the instructions carefully: “Create a numbers variable and assign it the value of array.map()”.

There are no instructions for adding the .prototype or .call() method, or bind() etc.
This is an easy task:

new_variable = value;

the new_variable is numbers,
the value is array.map();

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5

Thank you!
Have a great time!

1 Like
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