# Test Your JavaScript Skills : ES8 (JavaScript 2017) - 45

## Introduction

Namaste, In this blog I will discuss 10 code scenarios on Javascript .

1. **Identify the output of the below program**
    
    ```javascript
    function fx() {
        return new Promise(resolve => {
          setTimeout(() => {
            resolve('resolved');
          }, 1000);
        });
      }
      
      async function asyncFx() {    
        const result = await fx();
        console.log(result); 
      }
      
      asyncFx();
    ```
    
    **a.resolved**
    
    **b.reject**
    
    **c.undefined**
    
    **d.error**
    
    **e.null**
    
    **Answer:a**
    
    **Reason:The promise is successfully completed.**
    
2. **Identify the output of the below program**
    
    ```javascript
    function fx() {
        return new Promise((resolve,reject) => {
          setTimeout(() => {
            reject('resolved');
          }, 1000);
        });
      }
      
      async function asyncFx() {    
        const result = await fx();
        console.log(result); 
      }
      
      asyncFx();
    ```
    
    **a.reject**
    
    **b.error**
    
    **c.resolve**
    
    **d.undefined**
    
    **e.null**
    
    **Answer:b**
    
    **Reason:The program gives an error.**
    
3. **Identify the output of the below program**
    
    ```javascript
    
    async function getData() {
        try {
            let response = await  fetch("jsontest.com/key/value");
            let data = await response.json();
            console.log(data);
        }catch (err) {
                console.log("problem");
         }
    }
    getData();
    ```
    
    **a.problem**
    
    **b.{key:value}**
    
    **c.json**
    
    **d.undefined**
    
    **e.null**
    
    **Answer:a**
    
    **Reason:The incorrect url yields into an error.**
    
4. **Identify the output of the below program**
    
    ```javascript
    let city = {
        "delhi":1000,    
      };
      console.log(Object.entries(city));
    ```
    
    **a.** \[ 'delhi', 1000 \]
    
    **b.** { 'delhi', 1000 }
    
    **c. error**
    
    **d.** \[ \[ 'delhi', 1000 \] \]
    
    **e.** 'delhi', 1000
    
    **Answer:d**
    
    **Reason:The output is** \[ \[ 'delhi', 1000 \] \].
    
5. **Identify the output of the below program**
    
    ```javascript
    
    let city = {
        "delhi":1000,  
      };
      
      for (let [k,v] of Object.entries(city))
        console.log(k,v);
    ```
    
    **a.**\[ 'delhi', 1000 \]
    
    **b.** { 'delhi', 1000 }
    
    **c. error**
    
    **d.** \[ \[ 'delhi', 1000 \] \]
    
    **e.** 'delhi', 1000
    
    **Answer:e**
    
    **Reason:Individual values are extracted and printed.**
    
6. **Identify the output of the below program**
    
    ```javascript
    let city = {    
        "mumbai":2000,
        "bangalore":1500
      };
      
    console.log(Object.values(city));
    ```
    
    **a.\[2000,1500\]**
    
    **b.\[2000\]**
    
    **c.\[1500\]**
    
    **d.\[mumbai:2000\]**
    
    **e.\[bangalore:1500\]**
    
    **Answer:a**
    
    **Reason:The values() function only extracts the values.**
    
7. **Identify the output of the below program**
    
    ```javascript
    let city = {    
        "mumbai":2000,
        "bangalore":1500
      };
     
      let sum=0;
    for (let obj of Object.values(city)) {
       sum = obj + sum;
    }
    console.log(sum);
    ```
    
    **a.error**
    
    **b.undefined**
    
    **c.3500**
    
    **d.2000**
    
    **e.1500**
    
    **Answer:c**
    
    **Reason:The values are summed up.**
    
8. **Identify the output of the below program**
    
    ```javascript
    let city = {
        "delhi":1000,
     };
    let obj = Object.getOwnPropertyDescriptors(city);
    console.log(obj.delhi.enumerable);
    ```
    
    **a.true**
    
    **b.false**
    
    **c.delhi**
    
    **d.1000**
    
    **e.error**
    
    **Answer:a**
    
    **Reason:The enumerable is true by default.**
    
9. **Identify the output of the below program**
    
    ```javascript
    
    async function getData() {
        try {
            let response = await  fetch("http://echo.jsontest.com/key/value");
            let data = await response.json();
            console.log(data);
        }catch (err) {
                console.log("error ");
         }
    }
    
    getData();
    ```
    
    **a.{key:value}**
    
    **b.error**
    
    **c.echo**
    
    **d.undefined**
    
    **e.10**
    
    **Answer:a**
    
    **Reason:The value returned is {key:value}.**
    
10. **Identify the output of the below program**
    
    ```javascript
    function fx() {
        return new Promise((resolve,reject) => {
          setTimeout(() => {
            reject('resolved');
          }, 1000);
        });
      }
      
      async function asyncFx() {    
        try {
        const result = await fx();
        }catch (err) {
          console.log(err); 
        }
      }
      
      asyncFx();
    ```
    
    **a.resolved**
    
    **b.reject**
    
    **c.error**
    
    **d.undefined**
    
    **e.null**
    
    **Answer:a**
    
    **Reason:When error occurs catch block is called and prints resolved.**