How to remove an element from array in javascript without making a new?

Question

I read many answers but I didn't understand how to use splice in this case.. Suppose i have an array named alphabets like - ["a","b","c","d","e"] and i have to remove c from it. I dont want to create another array with c removed instead i want to update the same list each time an item is removed just like remove method in python. I know the index also so it can be like alphabets.remove[3]...to remove c. Please help me i am beginner.

Actually it would be better if there's a way that i can remove using just index number cause the names in array are very tough. Any help is appreciated

Check this [w3schools.com/jsref/jsref_splice.asp]

Vaibhav Gattyani
– Vaibhav Gattyani

2020-10-03 11:24:28 +00:00
Commented Oct 3, 2020 at 11:24 — Vaibhav Gattyani
– Vaibhav Gattyani, Commented Oct 3, 2020 at 11:24

T.J. Crowder · Accepted Answer · 2020-10-03 11:19:01Z

3

To modify the array rather than creating a new one, as you said you'd want the splice method. You pass the index of the item to remove, and the number of items to remove at that index:

const index = theArray.indexOf("c");
theArray.splice(index, 1);

Live Example:

const theArray = ["a","b","c","d","e"];
const rememberArray = theArray; // Just so we can prove it's the same array later
const index = theArray.indexOf("c");
theArray.splice(index, 1);
console.log(theArray);
console.log("Same array? " + (rememberArray === theArray));

answered Oct 3, 2020 at 11:19

T.J. Crowder

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3 Comments

Utkarsh Tyagi Over a year ago

Can you please help once again.. what if the item inside the array is not a string how can i get its index number ?

T.J. Crowder Over a year ago

@UtkarshTyagi - It doesn't matter what it is, indexOf will find it if you pass the same thing into indexOf, which effectively does a === comparison. Now, if you want to find the index of an object by checking its properties, or a string by a substring, or anything that isn't just a === comparison, you'd use findIndex with a callback (or find to find the object itself).

Utkarsh Tyagi Over a year ago

i have posted a question completely describing my problem It would be really helpful if you would answer there stackoverflow.com/questions/64192200/…

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