3 examples of 'javascript destructor' in JavaScript

34
destroy() {
35
	if (this.callback) {
36
		this.callback.call(this.scope || this);
37
	}
38
}

122
function callDestroy(context) {
123
    context.app.emit('componentDestroy', context);
124
125
    //delete context.app._componentsByUId[context.uId];
126
    const style = document.getElementById(context.uId + '--style');
127
    if (style) {
128
        style.parentNode.removeChild(style);
129
    }
130
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    if (context.store && context.app._stores[context.store])
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        delete context.app._stores[context.store];
133
134
    if (context._unmountedPlaceholder && context._unmountedPlaceholder.parentNode)
135
        context._unmountedPlaceholder.parentNode.removeChild(context._unmountedPlaceholder);
136
137
    if (context.id && context.app._ids[context.id])
138
        delete context.app._ids[context.id];
139
    if (typeof context.onDestroy === 'function' && context.parent && typeof context.parent[context.__onDestroy] === 'function') {
140
        context.onDestroy.call(context);
141
        context.parent[context.__onDestroy].call(context.parent, context);
142
        context = null;
143
    } else if (typeof context.onDestroy === 'function') {
144
        context.onDestroy.call(context);
145
        context = null;
146
    } else if (context.parent && typeof context.parent[context.__onDestroy] === 'function') {
147
        context.parent[context.__onDestroy].call(context.parent, context);
148
        context = null;
149
    }
150
151
}

14
_destructor() {
15
    if (this.parent !== null) {
16
        let index = this.parent.children.indexOf(this);
17
        if (index !== 0) {
18
            let last = this.parent.children[index - 1] as LinkedTreeNode;
19
            last.nextNode = this.nextNode;
20
        }
21
    }
22
    this.nextNode = null;
23
    super._destructor();
24
}