Replace with previous string in a JSON array

Question

I have the following array in a JSON file, is there a way to replace each 'TODO' with the entry above it. For example, the first "TODO" should be "Previous question" and the second should be "Next question".

   [
      {          
        "englishDefault": "Previous question",
        "default": "TODO"
      },
      {
       "englishDefault": "Next question",
       "default": "TODO"
      }
    ]

Hm.. Why do you need to get 2 entry with the same String ? + We need to know which language you use to process your json — Aks
– Aks, Commented Oct 17, 2016 at 9:39
When you say "the entry above it", will it always be the entry with the "englishDefault" key, or may it change? — Aaron
– Aaron, Commented Oct 17, 2016 at 9:40
As a side note, it's not a JSON array, it's just a JavaScript array ; JSON (JavaScript Object Notation) is the serialized form of a JavaScript Object, where you represent it as a String. I assume you're not working on a String but rather on the native array — Aaron
– Aaron, Commented Oct 17, 2016 at 9:44

Aaron · Accepted Answer · 2016-10-17 10:01:55Z

1

Here's how I would do it :

// with ES6
myArray.filter(i => i.default === "TODO").forEach(i => i.default = i.englishDefault);

//without ES6
for (var i=0; i<myArray.length; i++) {
    var cur = myArray[i];
    if (cur.default === "TODO") { cur.default = cur.englishDefault; }
}

edited Oct 17, 2016 at 10:01

answered Oct 17, 2016 at 9:47

Aaron

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4 Comments

Mulan Over a year ago

It should only write over the default property if it is set to "TODO" tho

timothyylim Over a year ago

@Aaron, great answer. Is there a way to extend it to nested instances of "englishDefault"?

Aaron Over a year ago

Yeah sure : you could test whether the current object's "englishDefault" field is defined ( !== undefined) and if it's not the case browse the object's field in search for an object with an "englishDefault" field

timothyylim Over a year ago

Thanks, I wasn't sure how to browse the object. I created a different question that explains my problem better: stackoverflow.com/questions/40086058/…

Aks · Accepted Answer · 2016-10-17 10:14:42Z

0

Improving @Aaron answer, you can use a for each and a ternary operator.

for each (question in myArray) { question.default == "TODO" ? question.default = question.englishDefault : null; }

answered Oct 17, 2016 at 10:14

Aks

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