Test your JavaScript Skills:Fundamentals-9

Introduction

Namaste, In this blog I will discuss 7 code scenarios on Javascript fundamentals.

Identify the output of the below program
```
 if (undefined)
   console.log("true");
 else
   console.log("false");
```
a.true

b.false

c.error

d. undefined

e.NaN

Answer: b

Reason: Here undefined is a false value.
Identify the output of the below program
```
 if(-1)  
     console.log("true");
 else
     console.log("false");
```
a.error

b.undefined

c.NaN

d. true

e.false

Answer: d

Reason: -1 is a truthy value.
Identify the output of the below program
```
 if(null)  
    console.log("true");
 else
   console.log("false");
```
a.NaN

b.true

c.false

d. undefined

e.error

Answer: c

Reason: null is a falsey value.
Identify the output of the below program
```
 if(2)  
       console.log("true");
 else
       console.log("false");
```
a.false

b.true

c. undefined

d. NaN

e.error

Answer: b

Reason: 2 is a truthy value.
Identify the output of the below program
```
 if(0)  
       console.log("true");
 else
       console.log("false");
```
a.false

b.true

c.NaN

d. Error

e.undefined

Answer: a

Reason: 0 is a falsey value.
Identify the output of the below program
```
 let str = "ram";
 if(str)  
     console.log("true"); 
 else
   console.log("false");
```
a.false

b.NaN

c.undefined

d. true

e.error

Answer: d

Reason: A string is a truthy value.
Identify the output of the below program
```
 if(NaN)  
   console.log("true");
 else
   console.log("false");
```
a.false

b.true

c.NaN

d. undefined

e.error

Answer: a

Reason: NaN is a falsey value.

Test your JavaScript Skills:Fundamentals-9

Part 9

Introduction