21337235
Description
Flashcards by Rosa Luz Estevané Rodríguez, updated more than 1 year ago
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Created by Rosa Luz Estevané Rodríguez
over 4 years ago
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| Question | Answer |
| What is a radio button? | |
| What is a check box? | |
| How can you verify if a radio button is selected? | With the property checked. Example: if (document.getElementById("male").checked == true) |
| What will be the final value of amount after executing the code: var amount = 10 amount = amount + 20 | amount = 30 As it had a value of 10 and it is used to accumulate 20 |
| Common name of a device that detects a signal, that is a form of energy, and converts it to another | Sensor |
| Which are the sensors included in a phone? | |
| What is the purpose of the instruction Math.floor() ? | Round down a number Example: The result of Math.floor(9.9) is 9 |
| The instruction Math.floor (Math.random()*10)+1 will produce a random number in the range of: | Numbers from 1 to 10 |
| How would you generate a random number from 0 to 27 | var number = Math.floor(Math.random()*28) |
| Which are the parts of a for loop? | for (var i=0; i<limit; i++){ block of instructions to repeat } These are: initialization of the counter, condition to be in the loop, increment of the counter and instructions to repeat |
| i = 6 Because the last value of the variable is the one that makes the condition false | |
| It will be executed 3 times: when i = 0, then i=1 and i=2 when i=3 the loop ends | |
| There are 2 conditions that would work perfect: count<=20 OR count<21 as both include 20 | |
| Prompt() Example: var name = prompt ("Please enter your name"); | |
| How could you create an array that holds the first 3 months of the year? | var months = ['Jan', 'Feb','Mar']; |
| How 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! |
| What property tells how many elements are included in an array? | the property length Example: var myarray = [2020, 2016] var total = myarray.length |
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