diff --git a/src/g3d.ts b/src/g3d.ts
index f7c3f12..a598e6d 100644
--- a/src/g3d.ts
+++ b/src/g3d.ts
@@ -201,36 +201,36 @@ class G3D {
       return;
     }
     let message = '--- g3d information ---\n';
-    message += 'magic:              : ' + this.header.magic.toString(16) + '\n';
-    message += 'width        [pixel]: ' + this.header.width.toString() + '\n';
-    message += 'height       [pixel]: ' + this.header.height.toString() + '\n';
-    message += 'depth        [pixel]: ' + this.header.depth.toString() + '\n';
-    message += 'org_width    [pixel]: ' + this.header.org_width.toString() + '\n';
-    message += 'org_height   [pixel]: ' + this.header.org_height.toString() + '\n';
-    message += 'org_depth    [pixel]: ' + this.header.org_depth.toString() + '\n';
-    message += 'datatype     [byte] : ' + this.header.datatype.toString() + '\n';
-    message += 'unit         [m|E]  : ' + this.header.unit.toString() + '\n';
-    message += 'grid         [unit] : ' + this.header.grid.toString() + '\n';
-    message += 'surface voxel[unit] : ' + this.header.vs_width.toString() + '\n';
-    message += 'voxel width  [unit] : ' + this.header.v_width.toString() + '\n';
-    message += 'voxel height [unit] : ' + this.header.v_height.toString() + '\n';
-    message += 'voxel depth  [unit] : ' + this.header.v_depth.toString() + '\n';
-    message += 'ax           [deg]  : ' + this.header.ax.toString() + '\n';
-    message += 'ay           [deg]  : ' + this.header.ay.toString() + '\n';
-    message += 'az           [deg]  : ' + this.header.az.toString() + '\n';
-    message += 'ox           [pixel]: ' + this.header.ox.toString() + '\n';
-    message += 'oy           [pixel]: ' + this.header.oy.toString() + '\n';
-    message += 'oz           [pixel]: ' + this.header.oz.toString() + '\n';
-    message += 'ox_real      [unit] : ' + (this.header.ox * this.header.vs_width).toString() + '\n';
-    message += 'oy_real      [unit] : ' + (this.header.oy * this.header.vs_width).toString() + '\n';
-    message += 'oz_real      [unit] : ' + (this.header.oz * this.header.vs_width).toString() + '\n';
-    message += 'surface voxels      : ' + this.header.s_num.toString() + '\n';
-    message += 'threshold           : ' + this.header.s_th.toString() + '\n';
-    message += 'date                : ' + this.header.date + '\n';
-    message += 'coordinate          : ' + this.header.coordinate + '\n';
-    message += 'subject             : ' + this.header.subject + '\n';
-    message += 'memo                : ' + this.header.memo + '\n';
-    message += 'File Type           : ' + (this.isLittleEndianFile ? 'Little Endian.' : 'Big Endian');
+    message += `magic:              : ${this.header.magic.toString(16)}\n`;
+    message += `width        [pixel]: ${this.header.width.toString()}\n`;
+    message += `height       [pixel]: ${this.header.height.toString()}\n`;
+    message += `depth        [pixel]: ${this.header.depth.toString()}\n`;
+    message += `org_width    [pixel]: ${this.header.org_width.toString()}\n`;
+    message += `org_height   [pixel]: ${this.header.org_height.toString()}\n`;
+    message += `org_depth    [pixel]: ${this.header.org_depth.toString()}\n`;
+    message += `datatype     [byte] : ${this.header.datatype.toString()}\n`;
+    message += `unit         [m|E]  : ${this.header.unit.toString()}\n`;
+    message += `grid         [unit] : ${this.header.grid.toString()}\n`;
+    message += `surface voxel[unit] : ${this.header.vs_width.toString()}\n`;
+    message += `voxel width  [unit] : ${this.header.v_width.toString()}\n`;
+    message += `voxel height [unit] : ${this.header.v_height.toString()}\n`;
+    message += `voxel depth  [unit] : ${this.header.v_depth.toString()}\n`;
+    message += `ax           [deg]  : ${this.header.ax.toString()}\n`;
+    message += `ay           [deg]  : ${this.header.ay.toString()}\n`;
+    message += `az           [deg]  : ${this.header.az.toString()}\n`;
+    message += `ox           [pixel]: ${this.header.ox.toString()}\n`;
+    message += `oy           [pixel]: ${this.header.oy.toString()}\n`;
+    message += `oz           [pixel]: ${this.header.oz.toString()}\n`;
+    message += `ox_real      [unit] : ${(this.header.ox * this.header.vs_width).toString()}\n`;
+    message += `oy_real      [unit] : ${(this.header.oy * this.header.vs_width).toString()}\n`;
+    message += `oz_real      [unit] : ${(this.header.oz * this.header.vs_width).toString()}\n`;
+    message += `surface voxels      : ${this.header.s_num.toString()}\n`;
+    message += `threshold           : ${this.header.s_th.toString()}\n`;
+    message += `date                : ${this.header.date}\n`;
+    message += `coordinate          : ${this.header.coordinate}\n`;
+    message += `subject             : ${this.header.subject}\n`;
+    message += `memo                : ${this.header.memo}\n`;
+    message += `File Type           : ${this.isLittleEndianFile ? 'Little Endian.' : 'Big Endian'}`;
     console.log(message);
   }
 
@@ -389,7 +389,7 @@ class G3D {
       }
       case 1: {
         this._transSurface(cutdepth, pdimg, irc);
-        let pos;
+        let pos: number;
         for (let j = (pos = 0); j < this.imageSize; j++) {
           for (let i = 0; i < this.imageSize; i++, pos++) {
             let pdPos = pdimg[pos];
@@ -999,7 +999,7 @@ class G3D {
   }
 
   private _fround(x: number, n: number) {
-    return Math.round(x * Math.pow(10, n)) / Math.pow(10, n);
+    return Math.round(x * 10 ** n) / 10 ** n;
   }
 
   private _initialize(data: ArrayBuffer): boolean {
@@ -1054,7 +1054,7 @@ class G3D {
       date: decoder.decode(new Uint8Array(data, (headerOffset += 256), 32)).replace(/\0+$/, ''),
       coordinate: decoder.decode(new Uint8Array(data, (headerOffset += 32), 32)).replace(/\0+$/, ''),
       subject: decoder.decode(new Uint8Array(data, (headerOffset += 32), 256)).replace(/\0+$/, ''),
-      memo: decoder.decode(new Uint8Array(data, (headerOffset += 256), 256)).replace(/\0+$/, ''), // eslint-disable-line no-useless-assignment
+      memo: decoder.decode(new Uint8Array(data, (headerOffset += 256), 256)).replace(/\0+$/, ''),
     };
     // set surface and image views
     const surfaceOffset = 964;
diff --git a/src/m3d.ts b/src/m3d.ts
index 461d314..2e24bb9 100644
--- a/src/m3d.ts
+++ b/src/m3d.ts
@@ -189,7 +189,6 @@ class M3D {
             if (pix > th) {
               this._drawPixel(img, pos, pix, pix, pix);
               ddimg[pos] = cutdepth;
-              continue;
             }
           }
         }
@@ -574,7 +573,7 @@ class M3D {
   }
 
   private _fround(x: number, n: number) {
-    return Math.round(x * Math.pow(10, n)) / Math.pow(10, n);
+    return Math.round(x * 10 ** n) / 10 ** n;
   }
 
   private _initialize(): void {
@@ -606,7 +605,7 @@ class M3D {
       oz: view.getFloat64((offset += 8), isLittleEndianFile),
       dlen: view.getInt32((offset += 8), isLittleEndianFile),
       dth: view.getInt32((offset += 4), isLittleEndianFile),
-      memo: decoder.decode(new Uint8Array(this.data, (offset += 4), 256)).replace(/\0+$/, ''), // eslint-disable-line no-useless-assignment
+      memo: decoder.decode(new Uint8Array(this.data, (offset += 4), 256)).replace(/\0+$/, ''),
     };
     // swap byte order if endian is not matched
     if ((this.isBigEndian() && isLittleEndianFile) || (!this.isBigEndian() && !isLittleEndianFile)) {