```javascript // 舉例 var firstName = "Ada"; var secondLetterOfFirstName = firstName[1]; // Setup var lastName = "Lovelace"; // Only change code below this line. var thirdLetterOfLastName = lastName[2]; ```
http://www.o2fo.com/chun5060/chun5060-yhu524ad.html```javascript // 舉例 var firstName = "Ada"; var lastLetterOfFirstName = firstName[firstName.length - 1]; // Setup var lastName = "Lovelace"; // Only change code below this line. var lastLetterOfLastName = lastName[lastName.length - 1]; ```
http://www.o2fo.com/chun5060/chun5060-pgo824ae.html```javascript // 舉例 var firstName = "Ada"; var thirdToLastLetterOfFirstName = firstName[firstName.length - 3]; // Setup var lastName = "Lovelace"; // Only change code below this line var secondToLastLetterOfLastName = lastName[lastName.length - 2]; ```
http://www.o2fo.com/chun5060/chun5060-183i24af.html```javascript // 舉例 var array = ["John", 23]; // Only change code below this line. var myArray = ['GO',1]; ```
http://www.o2fo.com/chun5060/chun5060-8idp24ag.html```javascript // 舉例 var ourArray = [["the universe", 42], ["everything", 101010]]; // Only change code below this line. var myArray = [["a",1],["b",2]]; ```
http://www.o2fo.com/chun5060/chun5060-7rei24ah.html```javascript // 舉例 var ourArray = [1,2,3]; var ourData = ourArray[0]; // equals 1 // Setup var myArray = [1,2,3]; // Only change code below this line. var myData = myArray[0]; ```
http://www.o2fo.com/chun5060/chun5060-7vsw24ai.html```javascript // 舉例 var ourArray = [1,2,3]; ourArray[1] = 3; // ourArray now equals [1,3,3]. // Setup var myArray = [1,2,3]; // Only change code below this line. myArray[0]=3; ```
http://www.o2fo.com/chun5060/chun5060-qkeo24aj.html```javascript // Setup var myArray = [[1,2,3], [4,5,6], [7,8,9], [[10,11,12], 13, 14]]; // Only change code below this line. var myData = myArray[2][1]; ```
http://www.o2fo.com/chun5060/chun5060-hguc24ak.html```javascript // 舉例 var ourArray = ["Stimpson", "J", "cat"]; ourArray.push(["happy", "joy"]); // ourArray now equals ["Stimpson", "J", "cat", ["happy", "joy"]] // Setup var myArray = [["John", 23], ["cat", 2]]; // Only change code below this line. myArray.push(["dog", 3]); ```
http://www.o2fo.com/chun5060/chun5060-69rq24al.html```javascript // 舉例 var ourArray = [1,2,3]; var removedFromOurArray = ourArray.pop(); // removedFromOurArray now equals 3, and ourArray now equals [1,2] // Setup var myArray = [["John", 23], ["cat", 2]]; // Only change code below this line. var removedFromMyArray=myArray.pop(); ```
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```javascript // 舉例 var firstName = "Ada"; var secondLetterOfFirstName = firstName[1]; // Setup var lastName = "Lovelace"; // Only change code below this line. var thirdLetterOfLastName = lastName[2]; ```
http://www.o2fo.com/chun5060/chun5060-yhu524ad.html```javascript // 舉例 var firstName = "Ada"; var lastLetterOfFirstName = firstName[firstName.length - 1]; // Setup var lastName = "Lovelace"; // Only change code below this line. var lastLetterOfLastName = lastName[lastName.length - 1]; ```
http://www.o2fo.com/chun5060/chun5060-pgo824ae.html```javascript // 舉例 var firstName = "Ada"; var thirdToLastLetterOfFirstName = firstName[firstName.length - 3]; // Setup var lastName = "Lovelace"; // Only change code below this line var secondToLastLetterOfLastName = lastName[lastName.length - 2]; ```
http://www.o2fo.com/chun5060/chun5060-183i24af.html```javascript // 舉例 var array = ["John", 23]; // Only change code below this line. var myArray = ['GO',1]; ```
http://www.o2fo.com/chun5060/chun5060-8idp24ag.html```javascript // 舉例 var ourArray = [["the universe", 42], ["everything", 101010]]; // Only change code below this line. var myArray = [["a",1],["b",2]]; ```
http://www.o2fo.com/chun5060/chun5060-7rei24ah.html```javascript // 舉例 var ourArray = [1,2,3]; var ourData = ourArray[0]; // equals 1 // Setup var myArray = [1,2,3]; // Only change code below this line. var myData = myArray[0]; ```
http://www.o2fo.com/chun5060/chun5060-7vsw24ai.html```javascript // 舉例 var ourArray = [1,2,3]; ourArray[1] = 3; // ourArray now equals [1,3,3]. // Setup var myArray = [1,2,3]; // Only change code below this line. myArray[0]=3; ```
http://www.o2fo.com/chun5060/chun5060-qkeo24aj.html```javascript // Setup var myArray = [[1,2,3], [4,5,6], [7,8,9], [[10,11,12], 13, 14]]; // Only change code below this line. var myData = myArray[2][1]; ```
http://www.o2fo.com/chun5060/chun5060-hguc24ak.html```javascript // 舉例 var ourArray = ["Stimpson", "J", "cat"]; ourArray.push(["happy", "joy"]); // ourArray now equals ["Stimpson", "J", "cat", ["happy", "joy"]] // Setup var myArray = [["John", 23], ["cat", 2]]; // Only change code below this line. myArray.push(["dog", 3]); ```
http://www.o2fo.com/chun5060/chun5060-69rq24al.html```javascript // 舉例 var ourArray = [1,2,3]; var removedFromOurArray = ourArray.pop(); // removedFromOurArray now equals 3, and ourArray now equals [1,2] // Setup var myArray = [["John", 23], ["cat", 2]]; // Only change code below this line. var removedFromMyArray=myArray.pop(); ```
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