Empty every memoizeByIdentity memo, releasing whatever their keys and values hold on to. Call where something large is discarded rather than replaced - a simulation being ended. Doing so is always safe: a memo is only ever an answer that can be worked out again, so the cost of emptying one that was still wanted is that it is filled again on the next call.

Crop a string to the specified length. fromStart indicates whether you want the first characters or the last characters.

Set an element of the list at the specified position. This function is slow: O(n). Do not use unless necessary.

Look up key in map, return defVal if key is not found

create inverse map

Array of map keys

Map a function over a pair of elements. mapPair f (x,y) = f x, f y.

Union of maps, common keys take m1 value

If key exists in map: (key:v) -> (key:update v), otherwise create new item (key : update v)

Array of map values

Return a memoized version of funcToMemoize where. Repeated calls with equivalent inputs return a stored result. Inputs a, a' are deemed equivalent if keyFunc a = keyFunc a'. Use this as well as LazyView etc, it has a different usage since it need not have React output and comparison is via a key function.

replace new lines in a string by ';' for easier debug printing of records using %A

Return 2^exponent.

return initial n characters of a string

Returns a new array with the elements at index i1 and index i2 swapped