ee.Feature.contains

Returns true iff the geometry of one feature contains the geometry of another.
UsageReturns
Feature.contains(right, maxError, proj)Boolean
ArgumentTypeDetails
this: leftElementThe feature containing the geometry used as the left operand of the operation.
rightElementThe feature containing the geometry used as the right operand of the operation.
maxErrorErrorMargin, default: nullThe maximum amount of error tolerated when performing any necessary reprojection.
projProjection, default: nullThe projection in which to perform the operation. If not specified, the operation will be performed in a spherical coordinate system, and linear distances will be in meters on the sphere.