30秒学会 Dart 片段 – frequencies
Returns a map with the unique values of a list as keys and their frequencies as the values. Use Iter...
Returns a map with the unique values of a list as keys and their frequencies as the values. Use Iter...
Runs an array of promises in series. Use Array.prototype.reduce() to create a promise chain, where e...
Filters out the unique values in a list. Use Iterable.where() in combination with List.indexOf() and...
Returns the maximum value of two or more numbers. Use math.Inf(-1) to set the initial maximum value ...
Returns the median of a collection of numbers. Find the midpoint and convert it to an integer, use s...
Flattens a list of lists once. Use nested list comprehension to extract each value from sub-lists in...
Results in a string representation of yesterday’s date. Use new Date() to get the current date...
Returns the sum of a list, after mapping each element to a number using the provided function. Use I...
Returns the index of the last element for which the provided function returns a truthy value. Use Ar...
Filters out the non-unique values in an array, based on a provided comparator function. Use Array.pr...