How can I loop through a JSON array in JavaScript and execute a function on each element?

Question

How can I loop through a JSON array in JavaScript and execute a function on each element?

I have been attempting to utilize a JavaScript method called f(x,y) with each element in a JSON array.

Below is an example of my code:

var jsonData = {"a":[1900,1910,1920,1930],"b":[12,19,8,55]}

for (var i=0; jsonData.a.length; i++){
  f(jsonData.a[i],jsonData.b[i])
}

Am I making a mistake with this approach? My code doesn't seem to be functioning as expected..

javascript arrays json loops

Answer 1

Answer №1

Your code is causing an infinite loop. Make sure to modify it to

for (let i = 0; i < jsonData.b.length; i++){

Answer 2

Your code is causing an infinite loop. Make sure to modify it to

for (let i = 0; i < jsonData.b.length; i++){

Answer 3

Answer №2

Setting a stopping condition for the loop is essential.

Revise the code as follows:

for (var i=0; i < jsonData.a.length; i++){

Instead of:

for (var i=0; jsonData.a.length; i++){

Answer 4

Setting a stopping condition for the loop is essential.

Revise the code as follows:

for (var i=0; i < jsonData.a.length; i++){

Instead of:

for (var i=0; jsonData.a.length; i++){

Answer 5

Answer №3

It appears that you have encountered an infinite loop.

You forgot to include a terminating condition in the for loop.

var data = {"x":[10,20,30,40],"y":[5,8,12,18]}

for (var j=0; j < data.x.length; j++){
  calculate(data.x[j],data.y[j])
}

Try adding a termination condition to prevent the infinite loop.

Answer 6

It appears that you have encountered an infinite loop.

You forgot to include a terminating condition in the for loop.

var data = {"x":[10,20,30,40],"y":[5,8,12,18]}

for (var j=0; j < data.x.length; j++){
  calculate(data.x[j],data.y[j])
}

Try adding a termination condition to prevent the infinite loop.

Answer 7

Answer №4

The condition in your for-loop is incorrect. Consider the following correction:

let data = {"x":[10,20,30,40],"y":[4,8,12,16]}

for (let j=0; j < data.x.length; j++){
    process(data.x[j],data.y[j])
}

Answer 8

The condition in your for-loop is incorrect. Consider the following correction:

let data = {"x":[10,20,30,40],"y":[4,8,12,16]}

for (let j=0; j < data.x.length; j++){
    process(data.x[j],data.y[j])
}

Answer 9

Answer №5

The condition of your loop is based on the length of "jsonData.a", which will always be considered true since it's a positive integer. A more concise way to write this loop would be using

for (var i=0; i < jsonData.a.length; i++) {...}

, or even better, utilizing the "for in" loop like so: for (var i in jsonData.a) {...}

Answer 10

The condition of your loop is based on the length of "jsonData.a", which will always be considered true since it's a positive integer. A more concise way to write this loop would be using

for (var i=0; i < jsonData.a.length; i++) {...}

, or even better, utilizing the "for in" loop like so: for (var i in jsonData.a) {...}

Answer 11

Answer №6

Here's another approach:

var iterate=Function.prototype.call.bind([].forEach)
var data = {"a":[1900,1910,1920,1930],"b":[12,19,8,55]}
function display(x,y){
    console.log(x+":"+y);
}
iterate(data.a, function(o,i){
    display(o,data.b[i]);
});

Check out this JSFiddle link to experiment: http://jsfiddle.net/sG5st/

Answer 12

Here's another approach:

var iterate=Function.prototype.call.bind([].forEach)
var data = {"a":[1900,1910,1920,1930],"b":[12,19,8,55]}
function display(x,y){
    console.log(x+":"+y);
}
iterate(data.a, function(o,i){
    display(o,data.b[i]);
});

Check out this JSFiddle link to experiment: http://jsfiddle.net/sG5st/

How can I loop through a JSON array in JavaScript and execute a function on each element?

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

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