JAVASCRIPT FROM SCRATCH TO END

Q144.) JSON stands for JavaScript Object Notation

JSON is a lightweight format for storing and transporting data

JSON is often used when data is sent from a server to a web page

JSON is "self-describing" and easy to understand {
"employees":[
{"firstName":"John", "lastName":"Doe"},
{"firstName":"Anna", "lastName":"Smith"},
{"firstName":"Peter", "lastName":"Jones"}
]
} JSON Syntax Rules
Data is in name/value pairs
Data is separated by commas
Curly braces hold objects
Square brackets hold arrays
The JSON format is syntactically identical to the code for creating JavaScript objects.

Because of this similarity, a JavaScript program can easily convert JSON data into native JavaScript objects.

144-147

Q148.)

let {key1, key2, key3} = obj1;

document.write( key1, key2, key3);

Q149.)<script>
let obj = {
key1:{
frontend: "Angular14",
backend:"Dotnet",
database:"SqlServer"
}
}
//let {key1} =obj;
//let {frontend} =key1;
document.write(obj.key1.frontend,obj.key1.backend,obj.key1.database);
</script>

Q150).

<script>
let obj3={
key1 :{
key2 :{
message :bye //bye
}
}
};
let over=obj3.key1;
let sai=over.key2;
document.write(sai.message);
</script>

Q151). <script>
let obj5={
key1 : "ReactJs",
key2 : {
sub : "NodeJs"
},
key3 : {
sub : "MongoDB"
}
};
let {key1,key2,key3}=obj5;

let {sub : sub1} = key2;
let {sub : sub2} = key3;
document.write(`<table border="1"
align="center">
<tr>
<th>Frontend</th>
<th>Backend</th>
<th>Database</th>
</tr>
<tr>
<td>${key1}</td>
<td>${sub1}</td>
<td>${sub2}</td>
</tr>
</table> `);

Q152).

<script>
let obj6={
key1 : {
sub1:ReactJs
},
key2 :{
sub2:MongoDb
},
key3 :{
sub3:NodeJs
}
};
let object1 =obj6.key1;
let inner1=object1.sub1;
let object2 =obj6.key2;
let inner2=object2.sub2;
let object3=obj6.key3;
let inner3=object3.sub3;
document.write(inner1,inner2,inner3);
</script>

Q153). <script>
let obj7={
key1: Hello_1,
key2:{
msg:Hello_2
}
};
let over=obj7.key1;
let come=obj7.key2;
let ver2=come.msg;
document.write(over,ver2);
</script>

Q154). <script>
let obj5 ={
key1:function(){
return 'Welcome to anonymous function';
}
};
let my_func = obj5.key1;
let over = my_func();
document.write(over);
</script>

Q155).<script>
let obj9 = [{p_id:111,p_name:"p_one",p_cost:10000},
{p_id:222,p_name:"p_two",p_cost:20000},
{p_id:333,p_name:"p_three",p_cost:30000},
{p_id:444,p_name:"p_four",p_cost:40000},
{p_id:555,p_name:"p_five",p_cost:50000}];

document.write(`<table border="1" align="center" cellpadding="10px" cellspacing="10px">

<tr>
<td>p_id</td>
<td>p_name</td>
<td>p_cost</td>
</tr>`);
obj9.forEach(function(element,index){
document.write(`
<tr>
<td>${element.p_id}</td>
<td>${element.p_name}</td>
<td>${element.p_cost}</td>
</tr>`)
});
document.write(</table>);

Try this level Hard complexity high

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