Navigating a JavaScript Array of Objects, Deleting Elements

In my Vue and Rails project, I am facing an issue with removing text from input fields when users switch between adding a new recipe and going back to the main page. While this functionality works for all fields except for ingredients, I am specifically struggling with deleting all ingredients from the array associated with the recipe object. Despite calling the removeIngredients function in a loop, only every other index is being captured, resulting in only half of the ingredients getting deleted.

resetNewRecipe: function(){
    this.recipe.name = '';
    this.recipe.chef = '';
    this.recipe.cooktime = '';
    this.recipe.amount = '';
    this.recipe.description = '';
    this.recipe.favorite = false;
    this.recipe.ingredients.name = '';
    for (i = 0; i < this.recipe.ingredients.length; i++){

      for (var name in this.recipe.ingredients[i]){

        if (this.recipe.ingredients[i].hasOwnProperty(name)){
          console.log("name = " + name);
          console.log("i = " + i);
          console.log("this.recipe.ingredients[i][name] " + this.recipe.ingredients[i][name]);

          this.removeIngredient(i);
        }
      }
    }
  },

The structure of the recipe object:

recipe: {
    name: '',
    chef: '',
    cooktime: '',
    amount: '',
    description: '',
    favorite: false,
    ingredients: [
      {name: ''},
    ]}

When testing with four ingredients named 1, 2, 3, and 4, only items 1 and 3 are successfully removed while 2 and 4 persist when returning to the form.

name = name
i = 0
this.recipe.ingredients[i][name] 1

name = name
i = 1
this.recipe.ingredients[i][name] 3

Answer №1

To efficiently remove all elements from the array, iterate in reverse order starting from the last index to 0. It is important to break out of the inner loop once an element is deleted:

for (var index = this.recipe.ingredients.length - 1; index >= 0; index--){ // Loop backwards
  for (var property in this.recipe.ingredients[index]){
    if (this.recipe.ingredients[index].hasOwnProperty(property)){
      this.removeIngredient(index);
      break; // Exit inner loop after deletion
    }
  }
}

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