function wrapper( value, aidx ) {
		return clbk.call( thisArg, value, aidx, x );
	}
Invokes a provided callback.

@private
@param {*} value - current array element
@param {NonNegativeInteger} aidx - current array element index
@param {NonNegativeInteger} sidx - current strided array element index
@param {Collection} arr - input array
@returns {*} result