Golang Syntax Summary (vi): constant Declaration and assignment

This is a creation in Article, where the information may have evolved or changed.

• The value of a constant must be determined at compile time, so either give a definite value directly, or use Go's own function (such as Len () to calculate the length);
  
• Declaring with the Const keyword
  

Examples of definitions and assignments:

const    _threshold   int      =      10       //full form    const    PI   =   < Span style= "Font-size:0.8rem" >   3.14       //can omit type, compiler automatically infers   const    STR   =   < Span style= "Font-size:0.8rem" >   " Hello World "  const (MAX_VALUE = 1000min_value   int      =       -   1000    LEN = len(STR))