Javascript Add number without split

Question

My first question was not really clear, sorry about that. So, I know about "split" method in JavaScript and now I want to add number to random array on a position that I can choose inside array, but without "split". Question is for understanding how algorithm "inside" "split" method is working. I wrote random array, so my idea is to use loop second times for a random array, create empty array add that number to position, then number that was before the position of our new number add to empty array and then got confused a bit.

var array1 = [];
for (var k= 0, t=100; k<t; k++){
    array1.push(Math.round(Math.random() * 300))
};

console.log(array1)

_I need to add number (...) to position that i'm choosing_... I don't see that. With this code you just generate an array of random numbers. How are you adding the number to the position (the one you're choosing)? — lealceldeiro, Jun 28 '18 at 13:04
You can always use a loop and move everything manually. What have you tried to far? Why don't you want to use `split` (`splice`)? Or is this homework...? — , Jun 28 '18 at 13:05
By saying `Is any algorithm without "split"?` do you mean you want to use other methods or do you want to write the method yourself? — Alex, Jun 28 '18 at 13:06
Voting to close as the question you're asking is unclear. Please rephrase your question then edit your post. — Ivan, Jun 28 '18 at 13:07
@lealceldeiro My guess is he's helpfully giving us code that creates a random array so when we give him the solution, we don't also need to write that first... — , Jun 28 '18 at 13:08
I know algorithm with split method. But i'm interested how to do this without ready methods. — rollback, Jun 28 '18 at 13:11
@rollback you should add that to you question: `I'm interested in how to do this without any JavaScript built in functions`. Because, for instance, there is an answer provided that does exactly that, uses a built in function. — lealceldeiro, Jun 28 '18 at 13:13

score 4 · Answer 1 · answered Jun 28 '18 at 13:05

4

Not sure what your code has to do with the question, but you can use Array.prototype.splice() to add an element at a specified index

const arr = ['foo', 'bar', 'baz'];
arr.splice(1, 0, 'bam');
//         ^ index
console.log(arr);

answered Jun 28 '18 at 13:05

baao

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... it was faster to answer than to find the duplicate; now it's closed for good @Ivan – baao Jun 28 '18 at 13:09
@bambam I found the duplicate by looking at OP's earlier questions :) I bet this is homework. – Jun 28 '18 at 13:10
@bambam look at the comment posted by the OP (`I know algorithm with split method. But i'm interested how to do this without ready methods`). This might not be what he/she is looking for. – lealceldeiro Jun 28 '18 at 13:14
Agree with you @bambam. I'm just pointing that out, since the OP is (persistently) asking about something else, not `splice` or any other built in function. Of course I would use what's already implemented (like `splice`). – lealceldeiro Jun 28 '18 at 13:18
Yeah, sorry for not informative question, split method i know very well, but inside, i think, split method contains algorithm. So that was my question, how to add/delete elements from array without "split" – rollback Jun 28 '18 at 13:20
@lealceldeiro :-) As soon as they manage to write a clear, good question, I'm sure someone takes the time to write an answer with a more specialised solution. – baao Jun 28 '18 at 13:20
There you go, no `split` used in the answer @rollback – baao Jun 28 '18 at 13:21

Javascript Add number without split

1 Answers1