avoid repeated calculation length

debug/simplemde.js

@@ -15945,7 +15945,9 @@ var Action = function () {
 			var toolbar_div = wrapper.previousSibling;
 			var toolbar = editor.options.toolbar ? editor.toolbarElements.preview : false;
 			var preview = wrapper.lastChild;
-			if (!preview || !/editor-preview/.test(preview.className)) {
+			var notCreate = !preview || !/editor-preview/.test(preview.className);
+
+			if (notCreate) {
 				preview = document.createElement("div");
 				preview.className = "editor-preview";
 				wrapper.appendChild(preview);
@@ -17136,7 +17138,8 @@ var SimpleMDE = function (_Action) {
 				// Don't include trailing separators
 				if (v === "|") {
 					var nonSeparatorIconsFollow = true;
-					for (var x = i + 1; x < _this3.toolbar.length; x++) {
+					var toolbarLength = _this3.toolbar.length;
+					for (var x = i + 1; x < toolbarLength; x++) {
 						if (_this3.toolbar[x] !== "|" && (!_this3.options.hideIcons || _this3.options.hideIcons.indexOf(name) == -1)) {
 							nonSeparatorIconsFollow = false;
 						}
@@ -17532,7 +17535,9 @@ exports.default = new (function () {
 			var m = data.match(pattern);
 			var count = 0;
 			if (m === null) return count;
-			for (var i = 0; i < m.length; i++) {
+
+			var mLength = m.length;
+			for (var i = 0; i < mLength; i++) {
 				if (m[i].charCodeAt(0) >= 0x4E00) {
 					count += m[i].length;
 				} else {

src/js/action.js

@@ -490,7 +490,9 @@ export default class Action {
 		let toolbar_div = wrapper.previousSibling;
 		let toolbar = editor.options.toolbar? editor.toolbarElements.preview: false;
 		let preview = wrapper.lastChild;
-		if (!preview || !/editor-preview/.test(preview.className)){
+		const notCreate = !preview || !/editor-preview/.test(preview.className)
+
+		if (notCreate){
 			preview = document.createElement("div");
 			preview.className = "editor-preview";
 			wrapper.appendChild(preview);

src/js/simplemde.js

@@ -363,7 +363,8 @@ class SimpleMDE extends Action {
 			// Don't include trailing separators
 			if(v === "|") {
 				let nonSeparatorIconsFollow = true;
-				for(let x = (i + 1); x < this.toolbar.length; x++) {
+				const toolbarLength = this.toolbar.length
+				for(let x = (i + 1); x < toolbarLength; x++) {
 					if(this.toolbar[x] !== "|" && (!this.options.hideIcons || this.options.hideIcons.indexOf(name) == -1)) {
 						nonSeparatorIconsFollow = false;
 					}

src/js/utils.js

@@ -24,7 +24,9 @@ export default new class Utils {
 		const m = data.match(pattern);
 		let count = 0;
 		if(m === null) return count;
-		for(let i = 0; i < m.length; i++) {
+
+		const mLength = m.length
+		for(let i = 0; i < mLength; i++) {
 			if(m[i].charCodeAt(0) >= 0x4E00) {
 				count += m[i].length;
 			} else {