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Enable static method inheritance.

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This commit is contained in:
Neil Fraser
2021-06-30 06:50:00 -07:00
committed by Neil Fraser
parent 2c6d044c40
commit 8a3c701026
1 changed files with 11 additions and 1 deletions
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12
core/utils/object.js
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@@ -19,15 +19,25 @@ goog.provide('Blockly.utils.object');
/**
* Inherit the prototype methods from one constructor into another.
*
* @param {!Function} childCtor Child class.
* @param {!Function} parentCtor Parent class.
* @suppress {strictMissingProperties} superClass_ is not defined on Function.
*/
Blockly.utils.object.inherits = function(childCtor, parentCtor) {
// Set a .superClass_ property so that methods can call parent methods
// without hard-coding the parent class name.
// Could be replaced by ES6's super().
childCtor.superClass_ = parentCtor.prototype;
// Link the child class to the parent class so that static methods inherit.
Object.setPrototypeOf(childCtor, parentCtor);
// Replace the child constructor's prototype object with an instance
// of the parent class.
childCtor.prototype = Object.create(parentCtor.prototype);
childCtor.prototype.constructor = childCtor;
// Alternatively, one could use this instead:
// Object.setPrototypeOf(childCtor.prototype, parentCtor.prototype);
};
/**