JavaScript - Execute a function when reaching the end of an array

Question

JavaScript - Execute a function when reaching the end of an array

I am currently working on a Node.js program that has a similar structure to the following:

var foo = [val,val,val....]
var bar = []

for(i=0;i<foo.length;i++){
  bar.push(foo[i])
  if(bar.length % 29 == 0){

    //do something with items 1-29 of bar

  bar.length = 0;
  }
}

The foo array contains over 1,000 items and I need to execute a specific function for every set of 29 items within it. I am using the bar array to successfully capture each set of 29 items and reset it once the function is performed. However - I am looking for guidance on how to handle the last remaining items in the foo array that are less than 29.

If anyone has suggestions or tips on how I can approach this issue, it would be greatly appreciated.

javascript arrays for-loop

Answer 1

Answer №1

let numbers = [1, 2, 3, ...]
for(index = 0; index < numbers.length; index += 29) {
    let subset = numbers.slice(index, index+29);
    // perform some operation on the subset
}

Answer 2

let numbers = [1, 2, 3, ...]
for(index = 0; index < numbers.length; index += 29) {
    let subset = numbers.slice(index, index+29);
    // perform some operation on the subset
}

Answer 3

Answer №2

let values = [val, val, val....]
let container = []

for (let j = 0; j < values.length; j++) {
    container.push(values[j])
    if (container.length % 29 == 0 || j == values.length - 1) {

        //perform operations on items 1-29 of the container

        container.length = 0;
    }
}

By including the condition j == values.length - 1, the code will handle the final group of items even if it doesn't consist of exactly 29 elements. If values.length == 28, the operation will occur after processing the 28th item. With values.length == 40, it will trigger at the 29th and 40th items.

Answer 4

let values = [val, val, val....]
let container = []

for (let j = 0; j < values.length; j++) {
    container.push(values[j])
    if (container.length % 29 == 0 || j == values.length - 1) {

        //perform operations on items 1-29 of the container

        container.length = 0;
    }
}

By including the condition j == values.length - 1, the code will handle the final group of items even if it doesn't consist of exactly 29 elements. If values.length == 28, the operation will occur after processing the 28th item. With values.length == 40, it will trigger at the 29th and 40th items.

Answer 5

Answer №3

For every set of 29 elements in foo, the following code snippet can be implemented:

var foo = [1,2,3....];
var bar = [];
for(i=0;i<foo.length;i++){  
  bar.push(foo[i]);           
  if(bar.length >= 29)  {
    // perform actions on bar
    bar = [];
  }  
}
if(bar.length>0) {
    // perform actions on remaining elements in bar
}

Alternatively, a more elegant approach is to create partitions of size N and execute the same functionality:

var bar, size = 29;
for (var i=0, j=foo.length; i<j; i+=size) {
    bar = foo.slice(i, i+size);
    // perform actions on bar
}

Answer 6

For every set of 29 elements in foo, the following code snippet can be implemented:

var foo = [1,2,3....];
var bar = [];
for(i=0;i<foo.length;i++){  
  bar.push(foo[i]);           
  if(bar.length >= 29)  {
    // perform actions on bar
    bar = [];
  }  
}
if(bar.length>0) {
    // perform actions on remaining elements in bar
}

Alternatively, a more elegant approach is to create partitions of size N and execute the same functionality:

var bar, size = 29;
for (var i=0, j=foo.length; i<j; i+=size) {
    bar = foo.slice(i, i+size);
    // perform actions on bar
}

JavaScript - Execute a function when reaching the end of an array

Answer №1

Answer №2

Answer №3

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