Data types JavaScript

String Variable-length string that can be up to approximately 2 billion characters in length in the Unicode character set .
Numeric JavaScript sees no difference between a whole number value and a floating point value. All numbers in JavaScript are represented as floating point values by the 64-bit format that is defined by the UEEE754 standard (double type format). This means it can represent large numbers up to +-1.7976931348623157x10e308 and small numbers up to +-5x10e-324.
Writing the whole number constant:
Decimal numbers are written normally, for example 0, 3, -10003.
Hexadecimal numbers start with 0x, for example 0xff, 0xCAE91F2.
Writing the floating point number constant: Real number is written normally with decimal point, for example 3.14. It can also be written in exponencial form: the letter e is written after the real number, followed by a plus/minus sign and a whole number exponent, for example 7.12e+32, 2.458268e-12.
Boolean Logical value:
true (numeric value is "nonzero", mostly -1) or
false (numeric value is 0)
Object General, undefined object.
null Flag that value intentionally contains no valid data.
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