remove push

src/js/bootstrap-switch.js

@@ -2,6 +2,19 @@ import jquery from 'jquery';
 
 const $ = jquery || window.jQuery || window.$;
 
+function getClasses(options, id) {
+  const { state, size, disabled, readonly, indeterminate, inverse } = options;
+  return [
+    state ? 'on' : 'off',
+    size,
+    disabled ? 'disabled' : undefined,
+    readonly ? 'readonly' : undefined,
+    indeterminate ? 'indeterminate' : undefined,
+    inverse ? 'inverse' : undefined,
+    id ? `id-${id}` : undefined,
+  ].filter(v => v == null);
+}
+
 class BootstrapSwitch {
   constructor(element, options = {}) {
     this.$element = $(element);
@@ -13,32 +26,10 @@ class BootstrapSwitch {
     );
     this.prevOptions = {};
     this.$wrapper = $('<div>', {
-      class: () => {
-        const classes = [];
-        classes.push(this.options.state ? 'on' : 'off');
-        if (this.options.size) {
-          classes.push(this.options.size);
-        }
-        if (this.options.disabled) {
-          classes.push('disabled');
-        }
-        if (this.options.readonly) {
-          classes.push('readonly');
-        }
-        if (this.options.indeterminate) {
-          classes.push('indeterminate');
-        }
-        if (this.options.inverse) {
-          classes.push('inverse');
-        }
-        if (this.$element.attr('id')) {
-          classes.push(`id-${this.$element.attr('id')}`);
-        }
-        return classes
-          .map(this._getClass.bind(this))
-          .concat([this.options.baseClass], this._getClasses(this.options.wrapperClass))
-          .join(' ');
-      },
+      class: () => getClasses(this.options, this.$element.attr('id'))
+        .map(this._getClass.bind(this))
+        .concat([this.options.baseClass], this._getClasses(this.options.wrapperClass))
+        .join(' '),
     });
     this.$container = $('<div>', { class: this._getClass('container') });
     this.$on = $('<span>', {