Tips on incorporating an item into an array solely when a specific condition is met

Question

Tips on incorporating an item into an array solely when a specific condition is met

Consider the following arrow function that creates an array:

const myFunction = () => ["a", "b", "c"];

I am looking to modify this function to add another element if a specific argument is true.

For example, I want it to look like this:

const myFunction = (arg) => ["a", "b", "c", arg ? "d" : null];

The issue with this approach is that it still adds a null element when arg !== true. Instead, I need it to not add anything in this scenario.

javascript arrays ternary-operator arrow-functions

Answer 1

Answer №1

To include or exclude elements in an array based on the value of flag, you can utilize array spread. This will add an empty array or an array with a specific element (in this case, d) to the result array:

const myArrayFunction = (flag) => ["x", "y", "z", ...flag ? ['d'] : []];

console.log(JSON.stringify(myArrayFunction(true))); // ["x","y","z","d"]

console.log(JSON.stringify(myArrayFunction(false))); // ["x","y","z"]

Answer 2

To include or exclude elements in an array based on the value of flag, you can utilize array spread. This will add an empty array or an array with a specific element (in this case, d) to the result array:

const myArrayFunction = (flag) => ["x", "y", "z", ...flag ? ['d'] : []];

console.log(JSON.stringify(myArrayFunction(true))); // ["x","y","z","d"]

console.log(JSON.stringify(myArrayFunction(false))); // ["x","y","z"]

Answer 3

Answer №2

To combine arrays, you can utilize the concat method:

const mergeArrays = (input) => ["x", "y", "z"].concat(input ? ["w"] : []);

console.log(mergeArrays(true));
console.log(mergeArrays(false));

Answer 4

To combine arrays, you can utilize the concat method:

const mergeArrays = (input) => ["x", "y", "z"].concat(input ? ["w"] : []);

console.log(mergeArrays(true));
console.log(mergeArrays(false));

Answer 5

Answer №3

If you're looking to add elements to an array in JavaScript, you can make use of the Array push() method.

const updateArray = (value) => {
  const myArray = ["apple", "banana", "cherry"];
  if (value) myArray.push("date");
  return myArray;
};

console.log(updateArray(true));
console.log(updateArray(false));

Answer 6

If you're looking to add elements to an array in JavaScript, you can make use of the Array push() method.

const updateArray = (value) => {
  const myArray = ["apple", "banana", "cherry"];
  if (value) myArray.push("date");
  return myArray;
};

console.log(updateArray(true));
console.log(updateArray(false));

Answer 7

Answer №4

Extend the function by following these steps:

Create a new temporary array.
Add the element to the temporary array if necessary.
Finally, return the temporary array once all operations are complete.

const myFunction = (arg) => {
  var tempArray = ["a", "b", "c"];
  
  if (arg) {
    tempArray.push("d");
  }
  
  return tempArray;
};

console.log(myFunction(true) + "");
console.log(myFunction(false) + "");

Answer 8

Extend the function by following these steps:

Create a new temporary array.
Add the element to the temporary array if necessary.
Finally, return the temporary array once all operations are complete.

const myFunction = (arg) => {
  var tempArray = ["a", "b", "c"];
  
  if (arg) {
    tempArray.push("d");
  }
  
  return tempArray;
};

console.log(myFunction(true) + "");
console.log(myFunction(false) + "");

Answer 9

Answer №5

function newFunction(parameter) {
  let myArray = ['a', 'b', 'c'];
  return parameter === true ? myArray.concat('d') : myArray;
}

In alternative solutions, you may come across parameter ? instead of parameter === true ?. If you specifically want the newFunction to only add 'd' to the array when parameter is equal to true, then my solution is the way to go. However, if you want it to add 'd' for values like 17 but not for 0, then consider using other solutions.

Answer 10

function newFunction(parameter) {
  let myArray = ['a', 'b', 'c'];
  return parameter === true ? myArray.concat('d') : myArray;
}

In alternative solutions, you may come across parameter ? instead of parameter === true ?. If you specifically want the newFunction to only add 'd' to the array when parameter is equal to true, then my solution is the way to go. However, if you want it to add 'd' for values like 17 but not for 0, then consider using other solutions.

Answer 11

Answer №6

Here's another way to achieve the same result:

const myFunction = (argument) => {
   var arrayExample = ["element 1", "element 2", "element 3"];

   !argument || arrayExample.push("element 4");

   return arrayExample;
};

console.log(myFunction(false));
console.log(myFunction(true));

Answer 12

Here's another way to achieve the same result:

const myFunction = (argument) => {
   var arrayExample = ["element 1", "element 2", "element 3"];

   !argument || arrayExample.push("element 4");

   return arrayExample;
};

console.log(myFunction(false));
console.log(myFunction(true));

Answer 13

Answer №7

Ori has the perfect solution for handling modern browsers. However, if you find yourself dealing with an older browser that is causing issues-

["a", "b", "c"].concat(arg ? 'd' : [])

Answer 14

Ori has the perfect solution for handling modern browsers. However, if you find yourself dealing with an older browser that is causing issues-

["a", "b", "c"].concat(arg ? 'd' : [])

Answer 15

Answer №8

To cleverly organize your array, simply assign it to a variable and follow this example:

const arr = ["a", "b", "c"];
const addElement = argument => argument === true ? [...arr, "d"] : arr;

console.log(addElement(true));
console.log(addElement());

Answer 16

To cleverly organize your array, simply assign it to a variable and follow this example:

const arr = ["a", "b", "c"];
const addElement = argument => argument === true ? [...arr, "d"] : arr;

console.log(addElement(true));
console.log(addElement());

Tips on incorporating an item into an array solely when a specific condition is met

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

Answer №7

Answer №8

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