freeCodeCamp

2.3 KiB

Raw Blame History

id	title	challengeType	videoUrl
56bbb991ad1ed5201cd392ca	Access Array Data with Indexes	1	https://scrimba.com/c/cBZQbTz

Description

We can access the data inside arrays using indexes. Array indexes are written in the same bracket notation that strings use, except that instead of specifying a character, they are specifying an entry in the array. Like strings, arrays use zero-based indexing, so the first element in an array is element 0.
Example

var array = [50,60,70];
array[0]; // equals 50
var data = array[1];  // equals 60

Note
There shouldn't be any spaces between the array name and the square brackets, like array [0]. Although JavaScript is able to process this correctly, this may confuse other programmers reading your code.

Instructions

Create a variable called myData and set it to equal the first value of myArray using bracket notation.

Tests

tests:
  - text: The variable <code>myData</code> should equal the first value of <code>myArray</code>.
    testString: assert((function(){if(typeof myArray !== 'undefined' && typeof myData !== 'undefined' && myArray[0] === myData){return true;}else{return false;}})(), 'The variable <code>myData</code> should equal the first value of <code>myArray</code>.');
  - text: The data in variable <code>myArray</code> should be accessed using bracket notation.
    testString: assert((function(){if(code.match(/\s*=\s*myArray\[0\]/g)){return true;}else{return false;}})(), 'The data in variable <code>myArray</code> should be accessed using bracket notation.');

Challenge Seed

// Example
var ourArray = [50,60,70];
var ourData = ourArray[0]; // equals 50

// Setup
var myArray = [50,60,70];

// Only change code below this line.

After Test

if(typeof myArray !== "undefined" && typeof myData !== "undefined"){(function(y,z){return 'myArray = ' + JSON.stringify(y) + ', myData = ' + JSON.stringify(z);})(myArray, myData);}

Solution

var myArray = [50,60,70];
var myData = myArray[0];

2.3 KiB Raw Blame History