This document describes the syntax and format of arithmetic expression functions, related scenario examples, and more.

op_add function

accumulation operation. Accumulate multiple values, values can be strings or numeric, and different value data types must be consistent. Supported calculation range: integer -2 ^ 52 + 1~ 2 ^ 52-1, floating-point number -1.8e308~ 1.8e308.

Function syntax/format

parameters are described as follows:

Parameter	Parameter type	Required	Default value	Value range	Description
Value1	Number or String	Yes	/	/	The value to be calculated.
Value2	Number or String	Yes	/	/	The value to be calculated.

Function example

Function example 1:

Scenario: Known students' scores in language, mathematics and English subjects, calculate the total score of students.

Processing rules:

f_set("total",op_add(v("math"),v("chinese"),v("english")))

Log sample:

{
"math": 96,
"chinese": 98,
"total": 274
}

Processing result:

{
"math": 96,
"chinese": 98,
"total": 274,
"english": 80
}

Function example 2:

Scenario: According to the province, city and county streets, splicing out the detailed address.

Processing rules:

f_set("address",op_add("address:",v("province"),v("city"),v("town"),v("detail")))

Log sample:

{
"province": "Sichuan province",
"city": "Chengdu city",
"town": "Wuhou town",
"detail": "231 Hao, Wuhouci street"
}

Processing result:

{
"province": "Sichuan province",
"city": "Chengdu city",
"town": "Wuhou town",
"detail": "231 Hao, Wuhouci street",
"address": "Address：231 Hao, Wuhouci street, Wuhou town, Chengdu city, Sichuan province"
}

op_sub function

subtraction operation. Returns the difference between value1 and value2.

Function syntax/format

parameters are described as follows:

Parameter	Parameter type	Required	Default value	Value range	Description
Value1	Number	Yes	/	/	The value to be calculated.
Value2	Number	Yes	/	/	The value to be calculated.

Function example

scenario: The total number of employees is 100, of which 48 are male, and the number of women is calculated.

Processing rules:

f_set("female",op_sub(v("total"),v("man")))

Log sample:

{
"total": 100,
"female": 52
}

Processing result:

{
"total": 100,
"female": 52,
"man": 48
}

op_mul function

multiplication operation. Multiplication calculation returns the product of value1 and value2.

Function syntax/format

parameters are described as follows:

Parameter	Parameter type	Required	Default value	Value range	Description
Value1	Number	Yes	/	/	The value to be calculated.
Value2	Number	Yes	/	/	The value to be calculated.

Function example

scenario: speed times time to calculate the distance.

Processing rules:

f_set("distance",op_mul(v("speed"),v("time")))

Log sample:

{
"speed": 60,
"time": 8
}

Processing result:

{
"distance": 480,
"speed": 60,
"time": 8
}

op_div function

division operation. Returns the quotient of value1 divided by value2, the divisor value2 cannot be 0.

Function syntax/format

parameters are described as follows:

Parameter	Parameter type	Required	Default value	Value range	Description
Value1	Number	Yes	/	/	The value to be calculated.
Value2	Number	Yes	/	/	The value to be calculated.

Function example

scenario: total consumption amount/number of people calculation per capita consumption

Processing rules:

f_set("avg_cost",op_mul(v("cost"),v("people")))

log sample:

{
"cost": 1500,
"avg_cost": 150
}

Processing results:

{
"cost": 1500,
"avg_cost": 150,
"people": 10
}

op_sum function

addition operation. Returns the sum of value1 and value2, where value is a variable parameter that can compute multiple values.

Function syntax/format

parameters are described as follows:

Parameter	Parameter type	Required	Default value	Value range	Description
Value1	Number	Yes	/	/	The value to be added.
Value2	Number	Yes	/	/	The value to be added.

Function example

scenario: bill storage cost 150, traffic cost 100, search cost 200, total cost 450.

Processing rules:

f_set("total_cost",op_sum(v("storage_cost"),v("flow_cost"),v("search_cost")))

Log sample:

{
"storage_cost": 150,
"flow_cost": 100,
"total_cost": 450
}

Processing results:

{
"storage_cost": 150,
"flow_cost": 100,
"total_cost": 450,
"search_cost": 200
}

op_mod function

remainder calculation. Returns the remainder of value1 divided by value2.

Function syntax/format

parameters are described as follows:

Parameter	Parameter type	Required	Default value	Value range	Description
Value1	Number	Yes	/	/	Divisor.
Value2	Number	Yes	/	/	Divisor.

Function example

scenario: 10 afternoon tea, each person divided into three, calculate the remaining number of copies 1.

Processing rules:

f_set("remand",op_sum(v("total"),v("avg")))

Log sample:

{
"total": 10,
"remand": 1
}

Processing result:

{
"total": 10,
"remand": 1,
"avg": 3
}

op_null function

determines whether it is empty. Returns the bool value. True if value is empty or the None keyword, False otherwise.

Function syntax/format

parameters are described as follows:

Parameter	Parameter type	Required	Default value	Value range	Description
Value	Number	Yes	/	/	Value to be judged.

Function example

Function example 1:

Scenario: None keyword is empty.

Processing rule:

f_set("op_null",op_null(None))

Log sample:

{
"region_id": 1,
"region": "beijing"
}

Processing result:

{
"region_id": 1,
"op_null": "true",
"region": "beijing"
}

Function example 2:

Scenario: region field is not empty.

Processing rules:

f_set("region_null",op_null(v("region")))

Log example:

{
"region_id": 1,
"region": "beijing"
}

Processing results:

{
"region_id": 1,
"op_null": "false",
"region": "beijing"
}

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