Returns a random element from an array, using the provided weights as the probabilities for each element.

Use Array.prototype.reduce() to create an array of partial sums for each value in weights.
Use Math.random() to generate a random number and Array.prototype.findIndex() to find the correct index based on the array previously produced.
Finally, return the element of arr with the produced index.

继续阅读 30秒学会 JavaScript 片段 – weightedSample

Returns an array of n random integers in the specified range.

Use Array.from() to create an empty array of the specific length, Math.random() to generate a random number and map it to the desired range, using Math.floor() to make it an integer.

继续阅读 30秒学会 JavaScript 片段 – randomIntArrayInRange

Returns a random double in the specified range.

Use Random.nextDouble() to generate a random number between 0.0 and 1.0 and map it to the desired range.
Omit the optional parameter, min, to use a default minimu value of 0.0.
Omit the optional parameter, max, to use a default maximum value of 1.0.

继续阅读 30秒学会 Dart 片段 – randomDoubleInRange

Returns a a list of n random integers in the specified range.

Use List.generate() to generate a list with n terms, using a function that returns a random integer between min and max.
Omit the optional parameter, min, to use a default minimu value of 0.
Omit the optional parameter, max, to use a default maximum value of 100.

继续阅读 30秒学会 Dart 片段 – randomIntListInRange