Karteikarten
Review for Challenge 4
Karten in diesem Stapel (23)
- 1What is a radio button?
- 2What is a check box?
- 3How can you verify if a radio button is selected?With the property checked. Example:
if (document.getElementById("male").checked == true) - 4What will be the final value of amount after executing the code: var amount = 10 amount = amount + 20amount = 30
As it had a value of 10 and it is used to accumulate 20 - 5Common name of a device that detects a signal, that is a form of energy, and converts it to anotherSensor
- 6Which are the sensors included in a phone?
- 7What is the purpose of the instruction Math.floor() ?Round down a number
Example: The result of Math.floor(9.9) is 9 - 8The instruction Math.floor (Math.random()*10)+1 will produce a random number in the range of:Numbers from 1 to 10
- 9How would you generate a random number from 0 to 27var number = Math.floor(Math.random()*28)
- 10Which are the parts of a for loop?for (var i=0; i
- 11—i = 6
Because the last value of the variable is the one that makes the condition false
- 12—It will be executed 3 times:
when i = 0, then i=1 and i=2
when i=3 the loop ends
- 13—There are 2 conditions that would work perfect:
count<=20 OR
count<21
as both include 20
- 14—Prompt()
Example:
var name = prompt ("Please enter your name");
- 15—
- 16—
- 17—
- 18—
- 19—
- 20How could you create an array that holds the first 3 months of the year?var months = ['Jan', 'Feb','Mar'];
- 21How could you show the 2nd element of the array named months in a pop-up window?alert ( months[1] )
because the first position of the array is zero! - 22What property tells how many elements are included in an array?the property length
Example: var myarray = [2020, 2016]
var total = myarray.length - 23—
Informationen
- Beschreibung
- Karteikarten am Review for Challenge 4, erstellt von Rosa Luz Estevané Rodríguez am 17/03/2020.
- Erstellt von
- Rosa Luz Estevané Rodríguez
- Aufrufe
- 628
- Bewertung