Lists and Loops Review-Code.org

var list = [10, 5, 15];

for(var i=0; <INSERT CODE>; i++){

console.log(list[i]);

}

Which of the following will result in ONLY all the items in list being printed to the console if placed where the program reads <INSERT CODE> and the program is run?

• i < list [list.length]

• i < list.length

• i < list [0]

• i < list [1]

var numList = [10,20,30];

console.log ( numList [numList.length-1]);

What will be displayed in the console when this program runs?

• 2

• 3

• 20

• 30

wordList is a list of words that currently contains the values ["tree", "rock", "air"] Which of the following lines will result in the list containing the values ["air", "rock", "air"] ?

• wordList[0] = wordList[2]

• wordList[2] = wordList[0]

• insertItem(wordList, 0, "air")

• removeItem(wordList,0)

var numbersList = [20, 10, 5]

appendItem(numbersList, 50)

appendItem(numbersList,100)

removeItem(numbersList,1)

insertItem(numbersList, 0, 30)

console.log(numbersList.length)

What will be displayed when this program finishes running?

• 3

• 6

• 7

• 5

var count = 0

while (count != 5){

console.log(count);

count = count + 2;

}

What will be displayed in the console when the following program runs?

• 0

  2

  4

  6

• 0

  2

  4

• 2

  4

  6

• The program will result in an infinite loop.

for(var i = 0; i < 4; i++){

console.log(i);

}

What will the following program display in the console?

• 0

  1

  2

  3

• 0

  1

  2

  3

  4

• 1

  2

  3

• 1

  2

  3

  4

var sum = 0;

for(var i = 0; i < 5; i++){

sum = sum + i;

}

console.log(sum);

What will the following program display in the console?

• 0

• 5

• 10

• 15

ageList and gradeList contain information about students in a classroom. A programmer has already written the following code with that information.

var ages = [16,17,18, 17];

var names = [“Beni”, “Analise”, “Ricardo”, “Tanya”];

var filteredNames = [];

var age;

Which of the following programs will result in filteredNames only containing the names of students who are 17 or older?

• for(var i=0; i<ages.length; i++){

  age=ages[ i ];

  if(age<17){

  appendItem(filteredNames, age)

  }

  }

• for(var i=0; i<ages.length; i++){

  age=ages[ i ];

  if(age<17){

  appendItem(filteredNames, names[ i ])

  }

  }

• for(var i=0; i<ages.length; i++){

  age=ages[ i ];

  if(age>=17){

  appendItem(filteredNames, age)

  }

  }

• for(var i=0; i<ages.length; i++){

  age=ages[ i ];

  if(age>=17){

  appendItem(filteredNames, names[ i ])

  }

  }

var words = [“apple”,”bug”,”car”,”dream”,”ear”, “food”]

var filteredWords = [];

for(var i = 0; i < words.length; i++){

var word = words[i];

if (word.length < 4){

appendItem(filteredWords,word)

}

}

console.log(filteredWords);

If the program above is run, what will be displayed in the console?

• [apple, dream]

• [bug, car, ear]

• [bug, car, ear, food]

• [apple, dream, food]

A program is designed to determine the minimum value in a list of positive numbers called numList. The following program was written

var minimum = <MISSING CODE>

for(var i = 0; i < numList.length; i++){

if (numList[i] < minimum){

minimum = numList[i];

}

}

console.log(“The minimum is” + minimum);

Which of the following can be used to replace <MISSING CODE> so that the program works as intended for every possible list of positive numbers?

• 0

• 1000000

• numList.length

• numList[0]