BE METER REVIEW #4

You need to evaluate the following code segment. Line numbers are included for reference only.

01 var n;

02 console.log(typeof n);

03 var a =”3.4”;

04 console.log(typeof a);

05 var textArray=[“Welcome Back”], “Enter a Name”, “Incorrect Answer”];

06 console.log(typeof textArray);

07 var c=2.4;

08 console.log(typeof c);

09 var tag=null;

10 console.log(typeof tag);

Use the drop-down menus to select the answer choice that answers each question based on the information presented in the code segment.

What does the console.log function on lines 02,04,06,08,10 write to the console?

• undefined, string,array,number,object

• undefined, string,array,object,number

• undefined,number,string,array,object

• undefined, string,array,number,NaN

You are writing an engineering application. You need to create a function that will round numbers to 3 or more decimal places.

You need to create a function that receives the following two parameters:

The value parameter is the number to be formatted

The digits parameter is the number of digits to display

The function must return the value with the number of digits specified.

Which function should you use?

• function significance(value, digits){

  return value.toPrecision(digits);

  }

• function significance(value, digits){

  return value.toString(digits);

  }

• function significance(value, digits){

  return value.toFixed(digits);

  }

• function significance(value, digits){

  return value.toValueOf(digits);

  }

You analyze the following code fragment. Line numbers are included for reference only.

01 “use strict”;

02 var val1=25;

03 var val2=4;

04 function multiply(){

05 return val1*val2;

06 }

07

08 console.log(“Global multiply returns() ;” + multiply());

09 multiply();

10

11 function getProduct(){

12 var val1=2;

13 var val2=3;

14

15 function multiply(){

16 return val1*val2;

17 }

18

19 return multiply();

20 }

Choose two answers

• The call to the multiply function on line 09 returns 100: TRUE

• The call to the multiply function on line 09 returns 100: FALSE

• The call to the multiply function on line 19 returns 100: TRUE

• The call to the multiply function on line 19 returns 100: FALSE

Evaluate the following code. Line numbers are included for reference only.

01 var n=50;

02 var c=n+5;

03 var a=n%2;

04 var d=c/11;

05 n=d*2;

07 console.log(n,c,a,d);

What is the value of each variable at line 07? To answer, drag the appropriate value to the correct variable. Each value may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.

NOTE: Each correct selection is worth one point.

n,c,a,d

• 10, 55,0,5

• 10,5,0,25

• 100,25,10,5

• 100,55,5,25

It's creating a function that causes a delay.The function has the following requirements:

-A maximum value must be passed as parameters

- There must be a counter that starts at 1 and increases an unit with a iteration

- The counter value should appear every time the loop itetimes

- The loop should exit after showing the maximum value

Create the following function definition

code segments

1-console.log(recuento ++);

2-if (recuento > maximo) continue;

3-recuento =1;

4-while (false){

5-while (true){

6- if (recuento > maximo) break;

7- }

Order the code and create the program with the instruction above.

• 1,3,2,5,7

• 3,5,6,1,7

• 3,4,6,1,7

• 3,5,2,1,7

runs the following code

var cadena=””;

var j;

for(j=0; j<8;j++){

if (j==2){ continue;}

cadena+=j+” “;

}

Which value is saved in the string variable after you have to execute the code

• 3 4 5 6 7

• 1 3 4 5 6 7 8

• 0 1

• 0 1 3 4 5 6 7

• 0 1 3 4 5 6 7 8

He's writing a javascript program for a graphic design institute. One of the functions of the program checks whether the height of a graph is equal to or greater than the minimum size, 50, but not less than 100.

As you must complete the code, to answer select the appropriate code segments in the response area

Answers Area:

• >= && <

• >= || <

• <= && >

• <= || >

You are creating a function to determine whether or not a year is a leap year.

A year is a leap year if it is divisible by 4 but not by 100, it is not a leap year unless it is also divisible by 400.

How do you fill in the code?

To answer, select the appropriate code segments in the answer area.

function esanioBisiesto(anio){

var bEsBisiesto= _______________

bEsBisiesto=bEsBisiesto && (anio%100!=0);

bEsBisiesto=bEsBisiesto&& _______________

}

Choose two answers

• anio%4==0;

• (anio%400==0);

• anio%4!=0;

• (anio%400!=0)

You are writing JavaScript in an HTML document. If JavaScript is disabled, a message should appear informing the user that they should enable it.

You must select the correct HTML tag to appear when JavaScript is disabled.

Which tag should be used?

• script

• noscript

• meta

• link

The formula is written as follows.

x is squared and then multiplied by -1, where x is the value passed to the function and is the result returned by the function.

You have created the following code. The line numbers are included only as a reference.

01 function cuadrado(){

02

03 return y;

04}

You have to make sure that the result is correct.

• y=(x*x)-1;

• y=(x.x)-1;

• y=-1(x*x);

• y=-x(x*x);