Question

For a variable x=5, how do I know it is number five or the character ‘5’?

Btw, in JS, do characters follow the ASCII table? Then can I manipulate a character variable. For example, if variable x is character a, can I do x=x+1 to make it character b?

Answer 1

To see if x is the number 5, as opposed to the string “5”, you can use the identity operator:

if (x === 5) {
}

Identity will not do any implicit conversions; it will return true only if both operands are equal without any conversions.

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For example, if variable x is character a, can I do x=x+1 to make it
character b?

No. x = x + 1 will convert 1 to a string, perform string concatenation and return “a1”