how to split an array into multiple arrays with condition javascript-CodePudding

I have an example array like below. what I want, how to split an array into multiple arrays if the value satisfies a condition? like an example if the next value difference exceeds 9, it will automatically create a new array. Here its sample code.

    const arr = [1,2,3,4,5,6,7,8,25,26,27,28,29,50]
    

    //exmaple result = [[1,2,3,4,5,6,7,8], [25,26,27,28,29], [50]]

I've tried using array.reduce but it doesn't work or I haven't found a way

CodePudding user response：

I believe this is what you're trying to achieve:

const arr = [1,2,3,4,5,6,7,8,25,26,27,28,29,50];

const result = arr.reduce((acc, val) => {
    if (acc.length === 0 || Math.abs(acc.at(-1).at(-1) - val) > 9) {
        acc.push([val]);
    } else {
        acc.at(-1).push(val);
    }
    return acc;
}, [])

console.log(result);

Where array.at(-1) returns the last element.

CodePudding user response：

Hope this answer will help. I used array.slice() method.

read more about slice() method here

// array initialization
const arr=[1,2,3,4,5,6,7,8,25,26,27,28,29,50];


/* function which will receive an array(arr) and the difference(diff) so that 
when the difference between two values at consecutive indexes(ex: arr[1] and arr[2]) exceeds the diff, we will create new array.
*/

const findSubArrays=(arr,diff)=>{
    let newArray=[];
    let startIndex=0;
    for(let i=0;i<=arr.length;i  ){
         let nextIndex=i 1;
         if(arr[nextIndex]-arr[i]>diff){
            newArray.push([...arr.slice(startIndex,i)]);
            startIndex=i;
         }
     }
    return newArray;
}

const result=findSubArrays(arr,9);


console.log(result);//prints [ [ 1, 2, 3, 4, 5, 6, 7 ], [ 8, 25, 26, 27, 28 ],[50] ]