Number

Juttle Number module provides constants for numeric operations, and functions for number/string conversion. Refer to the Math module for other mathematical constants and functions.

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Number constants

Juttle supports these Number constants as well as Math constants. They can be referenced without an import directive in a Juttle program, but are more commonly found in the output of certain mathematical operations than used explicitly.

Constant	Description
Number.MAX_VALUE	Largest positive numeric value, approximately 1.7976931348623157e+308 Larger values are converted to Infinity
Number.MIN_VALUE	Smallest positive numeric value (closest to zero), approximately 5e-324 Smaller values are converted to 0 Note that the most negative number is -Number.MAX_VALUE
Number.NaN	Not-A-Number value, returned from illegal mathematical operations; always compares unequal to any other value including NaN The floating point literal NaNcan be used for shorter notation.
Number.NEGATIVE_INFINITY	-Infinityvalue which is less than -Number.MAX_VALUE The floating point literal -Infinitycan be used for shorter notation.
Number.POSITIVE_INFINITY	Infinityvalue which is greater than Number.MAX_VALUE The floating point literal Infinitiycan be used for shorter notation.

Example

const pos_inf = Number.POSITIVE_INFINITY;
emit 
| put div_by_zero = 1 / 0, inf = pos_inf
| filter div_by_zero = pos_inf
| filter inf > Number.MAX_VALUE
| put nan = inf / inf

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Number.fromString()

Convert a value of type String to type Number.

Number.fromString(string)

Example: Parse out HTTP status code from apache access log line, and convert to a number for mathematical comparison

emit -limit 1
| put message = '127.0.0.1 - frank [10/Oct/2000:13:55:36 -0700] "GET /apache_pb.gif HTTP/1.0" 404 347'
| put http_status = Number.fromString(String.split(message, ' ')[8]) 
| filter http_status > 200

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Number.toString()

Convert a value of type Number to type String.

Number.toString(number)

Example: print out numeric values

Note that multiple ways of printing numbers as part of a string are available. This example shows both Number.toString() conversion, and string interpolation without explicit conversion.

emit -from :0: -limit 10
| put value = count(), even = value%2
| reduce evens = count(even)
| put msg1 = "Count of even values: " + Number.toString(evens),
      msg2 = "There are ${evens} even values"

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