chunking array class in typescript

Question

I am trying to create a chunking class in typescript, since I keep reusing the same code over and over based on: Split array into chunks

Here is what I have:

export class array_chunk {

    arr = [];
    chunk: number;

    constructor(arr: any, chunk: number) {
        this.arr = arr;
        this.chunk = chunk;
    }

    forEachChunk(funct: Function) {
        for (let i = 0, j = this.arr.length; i < j; i += this.chunk) {
            const temparray = this.arr.slice(i, i + this.chunk);
            temparray.forEach((ta: any) => {
                funct();
            });
        }
    }
}

/// usage?

let me = new array_chunk([5, 4, 3], 1);
me.forEachChunk((chunkArray: any) => {
    console.log(JSON.stringify(chunkArray));
    return chunkArray;
});

I can't wrap my head around it it. Basically, I would like something similar to forEach but for the chunks. Then I could forEach that. Am I close? I realize there should be different ways of thinking about this as my example is just conjecture.

EDIT --> here is the SOLUTION code I ended up using thanks to @skovy

class array_chunk {

    arr: any[];
    chunk: number;

    constructor(arr: any[], chunk = 100) {
        this.arr = arr;
        this.chunk = chunk;
    }

    forEachChunk(funct: Function) {
        for (let i = 0, j = this.arr.length; i < j; i += this.chunk) {
            const tempArray = this.arr.slice(i, i + this.chunk);
            funct(tempArray);
        }
    }
}

/// usage

let me = new array_chunk([5, 4, 3, 2, 1, 3, 2, 4], 3);
me.forEachChunk((chunkArray: any[]) => {
        console.log("chunk");
    chunkArray.forEach((ca) => {
        console.log(ca);
    })
    return chunkArray;
});

score 0 · Accepted Answer · answered May 21 '20 at 01:27

It looks like forEachChunk expects a callback for each element in which that chunk will be passed. However, in the actual implementation, it's invoked as funct() without passing any argument.

Have you tried updating this call to pass the chunk: funct(ta).

chunking array class in typescript

1 Answers1