What is the best way to create a TypeScript function that merges actions together?

Question

What is the best way to create a TypeScript function that merges actions together?

I am currently working on a TypeScript function similar to the following:

    import multipleActionObject from page; 
    it("should be able to perform multiple operations", () => {
        multipleActionObject.chooseIndex(4).setValue(10);
    }

Instead of writing it like this:

   import multipleActionObject from page; 
    it("should be able to do multiple operations", () => {
        multipleActionObject.chooseAndSetNumber(4,10);
    }

Within my multipleActionObject class:

class multipleActionObject(){

        public chooseAndSetNumber(index,value){
           this.index[index].setValue(value)
        } 
 }

Is there a way I can create a helper function for the first approach?

typescript

Answer 1

Answer №1

To make use of the chooseIndex method in assigning an index property to the instance, followed by the retrieval of that index using the setValue method, you can implement a simple logic as shown below:

class actionModifierObject {
  constructor(array) {
    this.array = array;
  }
  
  chooseIndex(indx) {
    this._index = indx;
  return this;
}
  
setValue(val) {
   if (typeof this._index !== 'number') {
      throw new Error('No index assigned to set value');
    }
this.array[this._index] = val;
return this;
}

const obj = new actionModifierObject([5, 6, 7, 8]);
obj.chooseIndex(2).setValue(15);
console.log(obj.array[2]);

The concept demonstrated above is known as "method chaining", although it may seem unconventional to separate the selection process from the subsequent operation performed on that object.

Answer 2

To make use of the chooseIndex method in assigning an index property to the instance, followed by the retrieval of that index using the setValue method, you can implement a simple logic as shown below:

class actionModifierObject {
  constructor(array) {
    this.array = array;
  }
  
  chooseIndex(indx) {
    this._index = indx;
  return this;
}
  
setValue(val) {
   if (typeof this._index !== 'number') {
      throw new Error('No index assigned to set value');
    }
this.array[this._index] = val;
return this;
}

const obj = new actionModifierObject([5, 6, 7, 8]);
obj.chooseIndex(2).setValue(15);
console.log(obj.array[2]);

The concept demonstrated above is known as "method chaining", although it may seem unconventional to separate the selection process from the subsequent operation performed on that object.

Answer 3

Answer №2

Learn about the benefits of using a fluent interface

class multipleActionClass
{    
  selectIndex(index) {
      this.currentIndex=index;   
      return this;
  } 

  enterValue(value) {
      console.log(`set value ${value} at index ${this.currentIndex}`);
      // this.index[this.currentIndex].setValue(value) ...
      return this;
  } 
}

let multipleActionObject = new multipleActionClass();

multipleActionObject.selectIndex(1).enterValue(2);

Answer 4

Learn about the benefits of using a fluent interface

class multipleActionClass
{    
  selectIndex(index) {
      this.currentIndex=index;   
      return this;
  } 

  enterValue(value) {
      console.log(`set value ${value} at index ${this.currentIndex}`);
      // this.index[this.currentIndex].setValue(value) ...
      return this;
  } 
}

let multipleActionObject = new multipleActionClass();

multipleActionObject.selectIndex(1).enterValue(2);

What is the best way to create a TypeScript function that merges actions together?

Answer №1

Answer №2

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