Concatenates the values of a list of fields into a single value in a new field.
Hide omitted argument names for this function
Omitted Argument NamesThe argument name for
fieldcan be omitted; the following forms of this function are equivalent:logscale Syntaxconcat(["value"])and:
logscale Syntaxconcat(field=["value"])These examples show basic structure only.
For example:
concat([aidValue, cidValue], as=checkMe2)The function is not capable of combining arbitrary strings, or concatenating strings and fields together. The following will not work:
concat([field1,"/",field2], as=combined)
Instead, you can use the format() function:
format("%s/%s",field=[field1,field2],as=combined)concat() Examples
Click next to an example below to get the full details.
Concatenate Fields and Strings Together
Query
format("%s/%s",field=[dirname,filename],as=pathname)Introduction
The concat() is not able to concatenate fields and
strings together. For example to create a pathname based on the
directory and filename it is not possible to do:
concat([dirname,"/",filename],as=pathname)
This will raise an error. Instead, we can use
format().
Step-by-Step
Starting with the source repository events.
- logscale
format("%s/%s",field=[dirname,filename],as=pathname)Formats a value separating the two by a forward slash, creating the field pathname
Event Result set.
Summary and Results
The format() function provides a flexible method of
formatting data, including encapsulating or combining strings and fields
together.
Concatenate Multiple Values From Nested Array Elements
Concatenate multiple values from nested array elements using
objectArray:eval() function with
concat()
Query
objectArray:eval("foo[]", var=x, function={_mapped := concat([x.key.value, "x.key.others[0]", "x.key.others[1]"])}, asArray="_mapped[]")Introduction
In this example, the objectArray:eval() function is
used with the concat() function to concatenate
multiple deeply nested arrays of objects values in the array
foo[] and return the concatenated
values in the output field
_mapped[]
Example incoming data might look like this:
"foo[0].key.value": y
"foo[0].key.others[0]": 1
"foo[0].key.others[1]": 2
"foo[1].nothing": 355Step-by-Step
Starting with the source repository events.
- logscale
objectArray:eval("foo[]", var=x, function={_mapped := concat([x.key.value, "x.key.others[0]", "x.key.others[1]"])}, asArray="_mapped[]")Notice that a
varparameter can be used to give a different name to the input array variable inside the function argument. This is particularly useful whenever the input array name is very long. Event Result set.
Summary and Results
The query is used to concatenate multiple deeply nested arrays of objects values.
Sample output from the incoming example data:
_mapped[0]: y12
"foo[0].key.value": y
"foo[0].key.others[0]": 1
"foo[0].key.others[1]": 2Concatenate Values From Nested Array Elements
Concatenate deeply nested objects and arrays using
objectArray:eval() function with
concat()
Query
objectArray:eval("in[]", asArray="out[]", function={out := concat(["in.a", "in.b.c", "in.others[1].d"])})Introduction
In this example, the objectArray:eval() function is
used with the concat() function to concatenate
deeply nested arrays of objects values in the array
in[] and return the concatenated
values in the output field
out[].
Example incoming data might look like this:
in[0].a: 1
in[0].b.c: 2
in[0].others[0].d: 3
in[0].others[1].d: 4Step-by-Step
Starting with the source repository events.
- logscale
objectArray:eval("in[]", asArray="out[]", function={out := concat(["in.a", "in.b.c", "in.others[1].d"])})Iterates over the array from start to end (or to the first empty index in the array), applies the given function, and returns the concatenated results in a new output array name field out[].
Event Result set.
Summary and Results
The query is used to concatenate deeply nested arrays of objects.
Sample output from the incoming example data:
out[0]: 124Concatenate Values From Two Nested Array Elements
Concatenate values from two nested array elements returning output in flat array
Query
objectArray:eval("arr[]", var=x, function={_mapped := concat([x.a, x.b])}, asArray="_mapped[]")Introduction
In this example, the objectArray:eval() function is
used with the variable x to
concatenate the values a and
b from each array element. The
concat() function is used to return the
concatenated output into a new array.
Example incoming data might look like this:
arr[0]: machine
arr[0].a: a0
arr[0].b: b0
arr[1].a: a1
arr[1].b: b1
arr[1].c: c1
arr[2].a: a2
arr[4].b: b2
other: abcStep-by-Step
Starting with the source repository events.
- logscale
objectArray:eval("arr[]", var=x, function={_mapped := concat([x.a, x.b])}, asArray="_mapped[]")Concatenates the values
aandbfrom each array element and returns the results in a new array named _mapped. In this example,objectArray:eval()iterates over each element of the array and assigns each element to the variablexwhich is then used as an alias. The new field _mapped is created by concatenating the value using the aliasxto extract each object value from each element of the array. Notice that the output in this example is a flat array.For example, this array element:
arr[0].a: a0 arr[0].b: b0 is translated to:
_mapped[0]: a0b0 Event Result set.
Summary and Results
The query is used to concatenate values of two array elements.
Sample output from the incoming example data, the original values have not been removed:
_mapped[0]: a0b0
_mapped[1]: a1b1
_mapped[2]: a2
_mapped[3]: b2
arr[0]: machine
arr[0].a: a0
arr[0].b: b0
arr[1].a: a1
arr[1].b: b1
arr[1].c: c1
arr[2].a: a2
arr[4].b: b2
other: abcConcatenate Values in Two Fields - Example 1
Concatenate values in two fields into a single value in a new
array using the concat() function
Query
concat([aidValue, cidValue], as=checkMe2)Introduction
In this example, the concat() function concatenates
the AID (Agent ID) and CID (Customer ID) values into a single value in a
new array.
Step-by-Step
Starting with the source repository events.
- logscale
concat([aidValue, cidValue], as=checkMe2)Concatenates the values of the fields aidValue and cidValue into a single value in a new field named checkMe2.
The single value contains both the Agent ID and Customer ID information. It is recommended to have a consistent format and potentially include a separator between the AID and CID to ensure, that they can be easily parsed apart, if needed later.
Event Result set.
Summary and Results
The query is used to concatenate the values of a list of fields into a single value in a new field. Combining CID and AID values is, for example, useful for unique identification, troubleshooting, data analysis etc. This query is also useful in case you want to combine for example first names and last names from two different fields into the full name in a new field, or if you have a list of users and a list of the URLs visited, that you want to combine to see which user navigated which URLs.
Concatenate Values in Two Fields - Example 2
Concatenate values in two fields into a single value in a new
array using the concat() function
Query
concat([f1, f2], as="combined")Introduction
In this example, the concat() function concatenates
the values of two fields with different names
(f1 and
f2) into a single value in a new
field.
Step-by-Step
Starting with the source repository events.
- logscale
concat([f1, f2], as="combined")Concatenates the values of the arrays f1 and f2 into a single value in a new array named combined.
Event Result set.
Summary and Results
The query is used to concatenate the values of a list of fields into a single value in a new field. This query is useful in case you want to combine for example first names and last names from two different fields into the full name in a new field, or if you have a list of users and a list of the URLs visited, that you want to combine to see which user navigated which URLs.