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JavaScript Design Patterns for Coding Interviews

Challenge: Solution Review

Explore the singleton pattern implementation that controls object creation in JavaScript. Understand how to restrict instantiation to a single instance while managing default and custom values effectively. This lesson helps you grasp design patterns critical for optimizing object construction in coding interviews.

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Solution

Node.js
let configure = null;
class ConfigureVals{
    constructor(initvalues){
        this.xpoint = initvalues.xpoint || 0;
        this.ypoint = initvalues.ypoint || 0;
        this.shape = initvalues.shape || null;
    }
    static getConfiguration(initvalues){
        if (!configure) {
            configure = new ConfigureVals(initvalues)
            }
            return configure;
    }
}
var configureObj1 = ConfigureVals.getConfiguration({ "xpoint": 8, "ypoint" : 9, "shape" : "rectangle" });
console.log(configureObj1);
var configureObj2 = ConfigureVals.getConfiguration({ "xpoint": 2, "ypoint": 4, "shape" : "circle" });
console.log(configureObj2);

Explanation

In the solution, the ...