Import: collection/lists

The collection/lists import provides helpers for working with lists.

concat

concat(items, others[, ...additional])

Join multiple lists together, returning the resulting list. This helper must have at least two arguments supplied. Order is important, as the order of arguments is the order that lists will be appended.

Arguments

Examples

Concatenate two lists:

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Concatenate many lists:

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difference

difference(items[, ...additional])

Difference returns a new list with all values that exist in the first list that are not present in all remaining provided lists.

Arguments

Aliases

diff

Examples

Difference between two lists:

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Difference between many lists:

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intersection

intersection(items[, ...additional])

Intersection returns a list consisting of unique values that are present in all of the provided lists.

Arguments

Examples

Intersection between three lists:

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sort

sort(items, sort_function)

Sort will sort a list of elements according to the provided sort function, returning a new, sorted list.

Arguments

Sort Function

The provided sort function accepts two arguments, which can be considered as the current and next item. The function should return one of the following values:

The compare built-in method provides a way of performing comparisons against integers, floats or strings to return a supported value.

Examples

Sort a list of words:

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Sort a list of objects by a key:

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sum

sum(items)

Sum will add all elements within the provided list. The list must only contain integers or floats. The return value will always be a float.

Arguments

Examples

Perform a sum on a list of numbers:

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union

union(items[, ...additional])

Union will return a list that contains unique values from all provided lists.

Arguments

Examples

Perform a union on multiple lists:

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