How to Remove Items from Set based on a Condition in TypeScript - Step by Step Examples

How to Remove Items from Set based on a Condition in TypeScript ?

Answer

To remove items from a set based on a condition in TypeScript, you can use the forEach method combined with the delete method.

✐ Examples

1 Remove Even Numbers from a Set

In this example,

First, we create a set of numbers named numberSet with values const numberSet: Set = new Set([1, 2, 3, 4, 5]);.
Next, we iterate over the set using the forEach method.
Within the forEach method, we check if the current number is even.
If the number is even, we remove it using the delete method of the set.
We print the updated set to verify that even numbers have been removed.

TypeScript Program

const numberSet: Set<number> = new Set([1, 2, 3, 4, 5]);
console.log("Original Set:", numberSet);
numberSet.forEach((number) => {
    if (number % 2 === 0) {
        numberSet.delete(number);
    }
});
console.log("Set after removing even numbers:", numberSet);

Output

Original Set: Set { 1, 2, 3, 4, 5 }
Set after removing even numbers: Set { 1, 3, 5 }

2 Remove Strings Longer Than 4 Characters from a Set

In this example,

First, we create a set of strings named stringSet with values const stringSet: Set = new Set(["apple", "banana", "orange", "kiwi"]);.
Next, we iterate over the set using the forEach method.
Within the forEach method, we check if the length of the current string is greater than 4.
If the length is greater than 4, we remove the string using the delete method of the set.
We print the updated set to verify that strings longer than 4 characters have been removed.

TypeScript Program

const stringSet: Set<string> = new Set(["apple", "banana", "orange", "kiwi"]);
console.log("Original Set:", stringSet);
stringSet.forEach((str) => {
    if (str.length > 4) {
        stringSet.delete(str);
    }
});
console.log("Set after removing strings longer than 4 characters:", stringSet);

Output

Original Set: Set { 'apple', 'banana', 'orange', 'kiwi' }
Set after removing strings longer than 4 characters: Set { 'kiwi' }

Summary

In this tutorial, we learned How to Remove Items from Set based on a Condition in TypeScript language with well detailed examples.

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