Type Conversion (Manually)
Type conversion (also known as type casting) is when you explicitly convert a
value from one type to another. JavaScript provides several functions for this purpose.
Type Conversion:
String to Number:
let strNum ="123" ; //str
let num = Number(strNum);
123 = 123 "123"
console.log(num); //123
console.log(typeof num); //number
Number to String:
let num=456;
let str =String(num);
"456" 456
console.log(num); //"459"
console.log(typeof num); //string
Boolean to String:
let bool = true;
let strbool =String(bool);
"true" true
console.log(strbool); //"true"
console.log(typeof num); //string
String to Boolean:
let strtrue="true";
let strfalse="false"; //true
//let strfalse=" "; //false //truthy fasleshy
let booltrue=Boolean(strtrue);
let boolfalse=Boolean(strfalse);
console.log(booltrue); //true
console.log(boolfalse); //true
Parsing integers and floats:
let floatstr = "123.456";
let intnum = parseint(floatstr);
integer 123.456
let floatnum = parsefloat(floatstr);
123.456 123.456
console.log(floatnum); // no lose apdiyea print agum (flost)
output:
123.46
console.log(intnum); //456 lose last numbers
output;
123
Type Coercion:
Type coercion is when JavaScript automatically converts a
value from one type to another during an operation.
This often happens with equality checks and arithmetic operations.
Type Coercion (Automatically)
String and Number:
let result result ="5"+2; // (+) jscript str cconcadinate aga + ah eduthukkum.
console.log(result);
output:
52
let result result ="5"-2; // convert to mathematic function automatically..
console.log(result);
output:
3
let result result ="5"*2; // convert to mathematic function automatically..
console.log(result);
output:
10
Boolean and Number:
1 + 1
let result =true + 1;
console.log(result);
output:
2
0 + 1
let result =false + 1;
console.log(result);
output:
1
Coercion occurs in equality checks (==), but not in strict equality checks (===).
Equality checks
console.log(5=="5"); true // "5" vaa == automatic aa numberku convert panni irukku..
console.log(5==="5"); false // data type value equval ah check pannum..
console.log(5==5); true
0
console.log(0==false); //true
console.log(0===false); //false
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