Removing an element from an array in JavaScript: A step-by-step guide

Question

Removing an element from an array in JavaScript: A step-by-step guide

I've been struggling with this error for the past couple of hours. Currently, I'm in the process of developing an idle game centered around building your own city. The issue arises when I attempt to delete a building from the build queue array. Every time I try methods like .shift, .pop, .push, .indexOf(0) === 0, [0] === "" and even .splice(1,1), I keep getting errors stating that these functions are not recognized.

Unfortunately, none of my attempts have proven successful. Can anyone please provide assistance?

if (buildValue === 100 && buildQueue.indexOf("house") === 0){
    populationmax++;
    // Here, I need a command that will remove the first element from the buildQueue array.
    buildValue = 0;
}

javascript arrays function

Answer 1

Answer №1

Removing Elements from Arrays:

if (buildValue === 100 && buildQueue.indexOf("house") === 0){
  populationmax++;
  buildQueue.splice(0, 1); //removes the first element
  buildValue = 0;
}

JavaScript Example Snippet:

x = [1, 2, 3];
alert(x); //1,2,3
x.splice(0, 1);
alert(x); //2,3

Adding To or Creating Arrays:

Firstly, avoid putting a blank string inside the buildQueue array as it may cause issues later on. Instead, initialize your array like this:

buildQueue = [];

Secondly, when adding elements to an array, do not use +=, as it converts the array into a string. To add strings to your array correctly, use push() method like this:

buildQueue.push(someString);

By doing so, buildQueue will continue to be an array of strings.

Answer 2

Removing Elements from Arrays:

if (buildValue === 100 && buildQueue.indexOf("house") === 0){
  populationmax++;
  buildQueue.splice(0, 1); //removes the first element
  buildValue = 0;
}

JavaScript Example Snippet:

x = [1, 2, 3];
alert(x); //1,2,3
x.splice(0, 1);
alert(x); //2,3

Adding To or Creating Arrays:

Firstly, avoid putting a blank string inside the buildQueue array as it may cause issues later on. Instead, initialize your array like this:

buildQueue = [];

Secondly, when adding elements to an array, do not use +=, as it converts the array into a string. To add strings to your array correctly, use push() method like this:

buildQueue.push(someString);

By doing so, buildQueue will continue to be an array of strings.

Answer 3

Answer №2

let constructionProgress = 0,
    constructionQueue = [""],
    constructionSpeed = 1/200;
  if (constructionQueue[0]){
    constructionProgress += constructionSpeed;
  }
  if (constructionProgress >= 100){
    constructionProgress = 100;
  }
  if (constructionProgress === 100 && constructionQueue.indexOf("house") === 0){
    populationmax++;

    constructionProgress = 0;
  }
  if (constructionProgress === 100 && constructionQueue.indexOf("big house") === 0){
    populationmax+=4;

    constructionProgress = 0;
  }
  if (constructionProgress === 100 && constructionQueue.indexOf("gold storage") === 0){
    goldmax++;

    constructionProgress = 0;
  }
  if (constructionProgress === 100 && constructionQueue.indexOf("food storage") === 0){
    foodmax++;

    constructionProgress = 0;
  }
  if (constructionProgress === 100 && constructionQueue.indexOf("wood storage") === 0){
    woodmax++;

    constructionProgress = 0;
  }
  if (constructionProgress === 100 && constructionQueue.indexOf("stone storage") === 0){
    stonemax++;

    constructionProgress = 0;
  }
  if (constructionProgress === 100 && constructionQueue.indexOf("iron storage") === 0){
    ironmax++;

    constructionProgress = 0;
  }

  constructionSpeed = 0.2;

This is the complete process related to building constructions. When a new building is purchased, it will be added to the array like this:

constructionQueue += "newBuilding";

. Also, remember to remove the first element in each condition inside ifs as indicated by the comment.

Answer 4

let constructionProgress = 0,
    constructionQueue = [""],
    constructionSpeed = 1/200;
  if (constructionQueue[0]){
    constructionProgress += constructionSpeed;
  }
  if (constructionProgress >= 100){
    constructionProgress = 100;
  }
  if (constructionProgress === 100 && constructionQueue.indexOf("house") === 0){
    populationmax++;

    constructionProgress = 0;
  }
  if (constructionProgress === 100 && constructionQueue.indexOf("big house") === 0){
    populationmax+=4;

    constructionProgress = 0;
  }
  if (constructionProgress === 100 && constructionQueue.indexOf("gold storage") === 0){
    goldmax++;

    constructionProgress = 0;
  }
  if (constructionProgress === 100 && constructionQueue.indexOf("food storage") === 0){
    foodmax++;

    constructionProgress = 0;
  }
  if (constructionProgress === 100 && constructionQueue.indexOf("wood storage") === 0){
    woodmax++;

    constructionProgress = 0;
  }
  if (constructionProgress === 100 && constructionQueue.indexOf("stone storage") === 0){
    stonemax++;

    constructionProgress = 0;
  }
  if (constructionProgress === 100 && constructionQueue.indexOf("iron storage") === 0){
    ironmax++;

    constructionProgress = 0;
  }

  constructionSpeed = 0.2;

This is the complete process related to building constructions. When a new building is purchased, it will be added to the array like this:

constructionQueue += "newBuilding";

. Also, remember to remove the first element in each condition inside ifs as indicated by the comment.

Removing an element from an array in JavaScript: A step-by-step guide

Answer №1

Answer №2

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