Discard elements that are even:

Return the indices of the remaining elements:

Discard only the first expression selected:

Use the operator form of Discard:

Discard operates on values in an Association:

Discard rows in a Tabular object:

Discard numbers up to 100 that are divisible by 4:

Discard the first 3 of 4-tuples that read the same in reverse:

Discard 3×3 matrices of 0s and 1s that have determinant less than 2:

Discard eigenvalues that lie within the unit circle:

Find built-in Wolfram Language objects whose names are at least 36 characters long:

Remove numeric quantities from a product:

Find an approximation to by finding the proportion of points that lie within a disk:

Weather data from JFK airport:

Use TabularStructure to investigate the number of missing data:

Remove the rows with at least two missing values:

Discard is complementary to Select:

Discard is similar to Cases except that it uses a function instead of a pattern:

Discard the lists that have a sum of elements greater than 10:

Use Cases to get the same result:

Discard elements that are even:

Use GatherBy to separate odd and even elements:

Use GroupBy to construct an association explicitly containing as keys the results of the criterion:

Discard drops elements for which applying the criterion explicitly yields True:

The symbolic object x is included in both cases, since neither inequality gives True:

The head of the input expression is only preserved for the default "Element" property: