core, consensus: use slice.Clip capacity to Simplify code (#1892)

Author: wit765

consensus/XDPoS/api.go

@@ -580,7 +580,7 @@ func (api *API) getRewardFileNamesInRange(begin, end *rpc.BlockNumber) ([]reward
 
 	// compact the slice's memory
 	ret := rewardFileNames[startIndex:endIndex]
-	return ret[:len(ret):len(ret)], nil
+	return slices.Clip(ret), nil
 }
 
 func getEpochReward(account common.Address, header *types.Header) (AccountEpochReward, error) {

core/vm/evm.go

@@ -19,6 +19,7 @@ package vm
 import (
 	"errors"
 	"math/big"
+	"slices"
 	"sync/atomic"
 
 	"github.com/XinFinOrg/XDPoSChain/XDCx/tradingstate"
@@ -170,20 +171,20 @@ func NewEVM(blockCtx BlockContext, txCtx TxContext, statedb StateDB, tradingStat
 	default:
 		evm.table = &frontierInstructionSet
 	}
+	var extraEips []int
 	if len(evm.Config.ExtraEips) > 0 {
 		// Deep-copy jumptable to prevent modification of opcodes in other tables
 		evm.table = copyJumpTable(evm.table)
-	}
-	extraEips := make([]int, 0, len(evm.Config.ExtraEips))
-	for _, eip := range evm.Config.ExtraEips {
-		if err := EnableEIP(eip, evm.table); err != nil {
-			// Disable it, so caller can check if it's activated or not
-			log.Error("EIP activation failed", "eip", eip, "error", err)
-		} else {
-			extraEips = append(extraEips, eip)
+		for _, eip := range evm.Config.ExtraEips {
+			if err := EnableEIP(eip, evm.table); err != nil {
+				// Disable it, so caller can check if it's activated or not
+				log.Error("EIP activation failed", "eip", eip, "error", err)
+			} else {
+				extraEips = append(extraEips, eip)
+			}
 		}
 	}
-	evm.Config.ExtraEips = extraEips[0:len(extraEips):len(extraEips)]
+	evm.Config.ExtraEips = slices.Clip(extraEips)
 
 	return evm
 }