expr/README.adoc

Expr

Table of Contents

• 1. Expr
  • 1.1. Data types
    • 1.1.1. Numbers
    • 1.1.2. String

1. Expr

Expr is a GO package capable of analysing, interpreting and calculating expressions.

1.1. Data types

Expr supports numerical, string, relational, and boolean expressions.

1.1.1. Numbers

Numbers can be integers (GO int64) and float (GO float64). In mixed operations involving integers and floats, integers are automatically promoted to floats.

Table 1. Arithmetic operators

Symbol	Operation	Description	Examples
+ / -	change sign	Change the sign of values	-1 [-1], -(+2) [-2]
+	sum	Add two values	-1 + 2 [1], 4 + 0.5 [4.5]
-	subtracion	Subtract the right value from the left one	3 - 1 [2], 4 - 0.5 [3.5]
*	product	Multiply two values	-1 * 2 [-1], 4 * 0.5 [2.0]

1.1.2. String