Test your JavaScript Skills : Boolean() Object

Namaste, In this blog I will discuss 8 code scenarios on Boolean() Object and Boolean() function.

1. Identify the output of the below program

    let ob = Boolean();
    console.log(ob);
   

   a.true

   b.false

   c.null

   d.undefined

   e.error

   Answer: b

   Reason: The boolean() function returns false

2. Identify the output of the below program

    let ob = new Boolean();
    console.log(ob);
   

   a.Boolean(false)

   b.false

   c.true

   d.undefined

   e.error

   Answer: a

   Reason: The boolean() object for empty value returns Boolean(false)

3. Identify the output of the below program

    let ob = new Boolean(false);
    console.log(ob);
   

   a.true

   b.false

   c.undefined

   d.Boolean(false)

   e.error

   Answer: d

   Reason: The boolean() object returns Boolean(false)

4. Identify the output of the below program

    let ob = new Boolean(false);
    if (ob)
        console.log("true");
    else
        console.log("false");
   

   a.true

   b.false

   c.error

   d.undefined

   e.Boolean(false)

   Answer: a

   Reason: The ob is an object hence "true" is printed

5. Identify the output of the below program

    let ob = new Boolean("JS");
    console.log(ob);
   

   a.Boolean(false)

   b.false

   c.true

   d.Boolean(true)

   e.error

   Answer: d

   Reason: The new boolean("JS") object returns Boolean(true)

6. Identify the output of the below program

    let ob = Boolean(false);
    if (ob)
        console.log("true");
    else
        console.log("false");
   

   a.false

   b.true

   c.undefined

   d.Boolean(false)

   e.true

   Answer: a

   Reason: ob is a boolean primitive with value false, not an object

7. Identify the output of the below program

    let ob = Boolean(false);
    console.log(typeof ob);
   

   a.object

   b.boolean

   c.string

   d.number

   e.error

   Answer: b

   Reason: The Boolean() function returns a boolean value

8. Identify the output of the below program

    let ob = new Boolean(false);
    console.log(typeof ob);
   

   a.object

   b.boolean

   c.string

   d.number

   e.error

   Answer: a

   Reason: When new is used an object is created.