JavaScript Write a JavaScript function that reverse a number [duplicate] write javascript function in html,write javascript function in typescript,

This question already has answers here:
Answer:1

There is no split function in Number.prototype. So, n = n + "" is just a simple way to convert a number to a string.

From the spec

If Type(lprim) is String or Type(rprim) is String, then Return the String that is the result of concatenating ToString(lprim) followed by ToString(rprim)

If one of the operands in an expression with + is a string, the other operand is also coerced to a string and concatenated with it

console.log( 1 + 1 ) // sum
console.log( 1 + "1" ) // concatenation
console.log( true + "string" ) // concatenation
Answer:2
In javascript , there is no Explicit declaration of datatype, by assigning value to the variable , it implicitly takes the datatype like int,string.

In your case,Simple you are applying String function to integer , so you are getting Error.

So first convert integer value into String by using "toString()" function.

Solution:


function reverse_a_number(n) {
//Casting
n=n.toString();
  return Number(n.split("").reverse().join(""));
}
console.log(reverse_a_number(32243));
Answer:3

Cast the number to a string and then use split as numerical values don't have the split function. Again cast it to a number while returning

function reverse_a_number(n) {
n=n.toString();
  return Number(n.split("").reverse().join(""));
}
console.log(reverse_a_number(32243));
Answer:4

The reason is that split method works only on string values and your passing integer value as argument, that's why it's working only after casting it to string

Answer:5

You can't split a number. By using n = n + "", you're casting it a string and then splitting it. However, you're also returning a string! You'll want to cast it back to an integer before you return it.

Answer:6

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