Arrays (dw::core::Arrays)

Question 1

countBy

Answer 1

Counts the elements in an array that return true when the matching function is applied to the value of each element.

Question 2

divideBy

Answer 2

Breaks up an array into sub-arrays that contain the specified number of elements.

Question 3

drop

Answer 3

Drops the first n elements. It returns the original array when n <= 0 and an empty array when n > sizeOf(array).

Question 4

dropWhile

Answer 4

Drops elements from the array while the condition is met but stops the selection process when it reaches an element that fails to satisfy the condition.

Question 5

every

Answer 5

Returns true if every element in the array matches the condition.

Question 6

firstWith

Answer 6

Returns the first element that satisfies the condition, or returns null if no element meets the condition.

Question 7

indexOf

Answer 7

Returns the index of the first occurrence of an element within the array. If the value is not found, the function returns -1.

Question 8

indexWhere

Answer 8

Returns the index of the first occurrence of an element that matches a condition within the array. If no element matches the condition, the function returns -1.

Question 9

join

Answer 9

Joins two arrays of objects by a given ID criteria.

Question 10

leftJoin

Answer 10

Joins two arrays of objects by a given ID criteria.

Question 11

outerJoin

Answer 11

Joins two array of objects by a given ID criteria.

Question 12

partition

Answer 12

Separates the array into the elements that satisfy the condition from those that do not.

Question 13

slice

Answer 13

Selects the interval of elements that satisfy the condition: from <= indexOf(array) < until

Question 14

some

Answer 14

Returns true if at least one element in the array matches the specified condition.

Question 15

splitAt

Answer 15

Splits an array into two at a given position.

Question 16

splitWhere

Answer 16

Splits an array into two at the first position where the condition is met.

Question 17

sumBy

Answer 17

Returns the sum of the values of the elements in an array.

Question 18

take

Answer 18

Selects the first n elements. It returns an empty array when n <= 0 and the original array when n > sizeOf(array).