Core functions

Question 1

++

Answer 1

Concatenates two values.

Question 2

–

Answer 2

Removes specified values from an input value.

Question 3

abs

Answer 3

Returns the absolute value of a number.

Question 4

avg

Answer 4

Returns the average of numbers listed in an array.

Question 5

ceil

Answer 5

Rounds a number up to the nearest whole number.

Question 6

contains

Answer 6

Returns true if an input contains a given value, false if not.

Question 7

daysBetween

Answer 7

Returns the number of days between two dates.

Question 8

distinctBy

Answer 8

Iterates over an array and returns the unique elements in it.

Question 9

endsWith

Answer 9

Returns true if a string ends with a provided substring, false if not.

Question 10

entriesOf

Answer 10

Returns an array of key-value pairs that describe the key, value, and any attributes in the input object.

Question 11

filter

Answer 11

Iterates over an array and applies an expression that returns matching values.

Question 12

filterObject

Answer 12

Iterates a list of key-value pairs in an object and applies an expression that returns only matching objects, filtering out the rest from the output.

Question 13

find

Answer 13

Returns indices of an input that match a specified value.

Question 14

flatMap

Answer 14

Iterates over each item in an array and flattens the results.

Question 15

flatten

Answer 15

Turns a set of subarrays (such as [ [1,2,3], [4,5,[6]], [], [null] ]) into a single, flattened array (such as [ 1, 2, 3, 4, 5, [6], null ]).

Question 16

floor

Answer 16

Rounds a number down to the nearest whole number.

Question 17

groupBy

Answer 17

Returns an object that groups items from an array based on specified criteria, such as an expression or matching selector.

Question 18

indexOf

Answer 18

Returns the index of the first occurrence of the specified element in this array, or -1 if this list does not contain the element.

Question 19

isBlank

Answer 19

Returns true if the given string is empty (“”), completely composed of whitespaces, or null. Otherwise, the function returns false.

Question 20

isDecimal

Answer 20

Returns true if the given number contains a decimal, false if not.

Question 21

isEmpty

Answer 21

Returns true if the given input value is empty, false if not.

Question 22

isEven

Answer 22

Returns true if the number or numeric result of a mathematical operation is even, false if not.

Question 23

isInteger

Answer 23

Returns true if the given number is an integer (which lacks decimals), false if not.

Question 24

isLeapYear

Answer 24

Returns true if it receives a date for a leap year, false if not.

Question 25

isOdd

Answer 25

Returns true if the number or numeric result of a mathematical operation is odd, false if not.

Question 26

joinBy

Answer 26

Merges an array into a single string value and uses the provided string as a separator between each item in the list.

Question 27

keysOf

Answer 27

Returns an array of keys from key-value pairs within the input object.

Question 28

lastIndexOf

Answer 28

Returns the index of the last occurrence of the specified element in a given array or -1 if the array does not contain the element.

Question 29

log

Answer 29

Without changing the value of the input, log returns the input as a system log. So this makes it very simple to debug your code, because any expression or subexpression can be wrapped with log and the result will be printed out without modifying the result of the expression. The output is going to be printed in application/dw format.

Question 30

lower

Answer 30

Returns the provided string in lowercase characters.

Question 31

map

Answer 31

iterates over items in an array and outputs the results into a new array.

Question 32

mapObject

Answer 32

Iterates over an object using a mapper that acts on keys, values, or indices of that object.

Question 33

match

Answer 33

Uses a Java regular expression (regex) to match a string and then separates it into capture groups. Returns the results in an array.

Question 34

matches

Answer 34

Checks if an expression matches the entire input string.

Question 35

max

Answer 35

Returns the highest Comparable value in an array.

Question 36

maxBy

Answer 36

Iterates over an array and returns the highest value of Comparable elements from it.

Question 37

min

Answer 37

Returns the lowest Comparable value in an array.

Question 38

minBy

Answer 38

Iterates over an array to return the lowest value of comparable elements from it.

Question 39

mod

Answer 39

Returns the modulo (the remainder after dividing the dividend by the divisor).

Question 40

namesOf

Answer 40

Returns an array of strings with the names of all the keys within the given object.

Question 41

now

Answer 41

Returns a DateTime value for the current date and time.

Question 42

onNull

Answer 42

Executes a callback function if the preceding expression returns a null value and then replaces the null value with the result of the callback.

Question 43

orderBy

Answer 43

Reorders the elements of an input using criteria that acts on selected elements of that input.

Question 44

pluck

Answer 44

Useful for mapping an object into an array, pluck iterates over an object and returns an array of keys, values, or indices from the object.

Question 45

pow

Answer 45

Raises the value of a base number to the specified power.

Question 46

random

Answer 46

Returns a pseudo-random number greater than or equal to 0.0 and less than 1.0.

Question 47

randomInt

Answer 47

Returns a pseudo-random whole number from 0 to the specified number (exclusive).

Question 48

read

Answer 48

Reads a string or binary and returns parsed content.

Question 49

readUrl

Answer 49

Reads a URL, including a classpath-based URL, and returns parsed content. This function works similar to the read function.

Question 50

reduce

Answer 50

Applies a reduction expression to the elements in an array.

Question 51

replace

Answer 51

Performs string replacement.

Question 52

round

Answer 52

Rounds a number up or down to the nearest whole number.

Question 53

scan

Answer 53

Returns an array with all of the matches found in an input string.

Question 54

sizeOf

Answer 54

Returns the number of elements in an array. It returns 0 if the array is empty.

Question 55

splitBy

Answer 55

Splits a string into a string array based on a value that matches part of that string. It filters out the matching part from the returned array.

Question 56

sqrt

Answer 56

Returns the square root of a number.

Question 57

startsWith

Answer 57

Returns true or false depending on whether the input string starts with a matching prefix.

Question 58

sum

Answer 58

Returns the sum of numeric values in an array

Question 59

then

Answer 59

This function works as a pipe that passes the value returned from the preceding expression to the next (a callback) only if the value returned by the preceding expression is not null.

Question 60

to

Answer 60

Returns a range with the specified boundaries.

Question 61

trim

Answer 61

Removes any blank spaces from the beginning and end of a string.

Question 62

typeOf

Answer 62

Returns the type of a value.

Question 63

unzip

Answer 63

Performs the opposite of zip. It takes an array of arrays as input.

Question 64

upper

Answer 64

Returns the provided string in uppercase characters.

Question 65

uuid

Answer 65

Returns a v4 UUID using random numbers as the source.

Question 66

valuesOf

Answer 66

Returns an array of the values from key-value pairs in an object.

Question 67

with

Answer 67

Helper function that specifies a replacement element. This function is used with replace, update or mask to perform data substitutions.

Question 68

write

Answer 68

Writes a value as a string or binary in a supported format.

Question 69

xsiType

Answer 69

Creates a xsi:type type attribute. This method returns an object, so it must be used with dynamic attributes.

Question 70

zip

Answer 70

Merges elements from two arrays into an array of arrays.