Three non-standard types of numbers in JavaScript and two libraries

    JavaScript has one type of number by default - Number. Although it is of course divided into Int and Float, although it is expressed in a little (for example, in the parseInt functions - parseFloat).
    In this case, large numbers (both Int and Float) are shortened, and fractions are reduced to decimal and rounded. Both are not always good, so libraries have appeared that offer new classes for unusual numbers.


    Numbers (both Int and Float) are shortened to 15 characters. In Int, the remaining digits are stored as zeros. Example:
    >> 100000000000000000111

    The library is called BigNumber , numbers need to be transferred in the form of a line. We use:
    var num = new BigNumber('100000000000000000001');
    num.add(1); // 100000000000000000002

    The rest on the library page , there are most of the necessary functions (+ - * /), accept numbers, strings, and the same BigNumber.


    There is also a Float, there are also 15 characters there, but the extra digits are simply thrown away.
    >> 3.14159265358979323

    You can use the same library in the same format:
    var pi = new BigNumber('3.14159265358979323');
    pi.add('0.00000000000000003'); // 3.14159265358979326


    The third type is fractions. The number is rounded. And because of this, the result may go bad.
    >> 1/3
    >> 1/3 + 2/3
    >> 0.3333333333333333 + 0.6666666666666666

    And we have the library Fraction.js .
    var a = new Fraction(1,3);
    a.add( new Fraction(2,3) ); // 1

    That's all

    Thanks for attention

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