How to check how many times a word shows up in JSON array

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My JSON array looks like this:

    {
  "messages": [
    {
      "msg": "?",
      "name": "johndoe"
    },
    {
      "msg": "hello",
      "name": "johndoe",
    },
    {
      "msg": "twitt",
      "name": "johndoe"
    },
    {
      "msg": "hello everyone!",
      "name": "johndoe"
    },
    {
      "msg": "hello! how are you",
      "name": "johndoe"
    },
    {
      .........

I would like to know how I can check how many times the word "hello" shows up in this whole array, and then just return the number. Thank you for the help.

You can use reduce

const arr = {
  "messages": [{
      "msg": "?",
      "name": "johndoe"
    },
    {
      "msg": "hello",
      "name": "johndoe",
    },
    {
      "msg": "twitt",
      "name": "johndoe"
    },
    {
      "msg": "hello everyone!",
      "name": "johndoe!!"
    },
    {
      "msg": "hello! how are you",
      "name": "johndoe!"
    }
  ]
};

const count = arr.messages.reduce((acc, m) => {
  if (m.name === "johndoe") {
    acc += 1;
  }
  return acc;
}, 0);
console.log(count)

//shorter version
const count2 = arr.messages.reduce((acc, m) => m.name === "johndoe" ? acc += 1 : acc, 0);
console.log(count2)


// EDIT : if you wanna search for "johndoe" string and the name value is "johndoe!!"
const count3 = arr.messages.reduce((acc, m) => {
  if (m.name.includes("johndoe")) {
    acc += 1;
  }
  return acc;
}, 0);
console.log(count3)

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let helloCount = data.messages.filter(message=>{return message.msg.includes('hello')}).length;

Try above one

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You need the following.

data.forEach(ele => {if(ele.msg.includes('hello')) counter++ });

Here is a demo https://onecompiler.com/javascript/3v2spaetr

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Since it it's a valid JSON format it may as well be treated as a string (before parsing) if that's the case a simple regex would be enough to count the occurrences of particular string inside of it

const input = `{
  "messages": [
    {
      "msg": "?",
      "name": "johndoe"
    },
    {
      "msg": "hello",
      "name": "johndoe",
    },
    {
      "msg": "twitt",
      "name": "johndoe"
    },
    {
      "msg": "hello everyone!",
      "name": "johndoe"
    },
    {
      "msg": "hello! how are you",
      "name": "johndoe"
    }
  ]
}`;

function count(input, match){
  return (input.match(new RegExp(match, "g")) || []).length;
}

console.log("hello: ", count(input, "hello"));
console.log("johndoe: ", count(input, "johndoe"));

Practical Ajax Projects with Java Technology, Lastly, if the mo member in xhr.json indicates we are not in normal (i.e., walking then we are coming out of battle, which again requires setting the current view and Fortunately, this situation only comes up a few times, a majority of the time the as you might recall from our discussion of GameStateObject, is just an array​. If the word is equal to 'beach', then we append this word to the list, list1, with the append() function. We then create another variable, lengthstring, that gets the length of the list. This allows us to know how many times the word 'beach' appeared in the string. We then print out the number of times the word beach occurs in the string.

How to count items in a JSON object in Python, A JSON object is a string formatted as a dictionary object with key-value pairs. Counting the items in a JSON object returns the number of key-value pairs in the​  In our case, we want to check how many times a letter is in a string without caring if they are lowercase or uppercase. We can achieve this by using lower () function on the string which will make the whole text lowercase. If you don't want that, remove the lower () function. Line 2:

PHP substr_count() Function, The substr_count() function counts the number of times a substring occurs in a Note: This function does not count overlapped substrings (see example 2). In a simple data set, you can look at the results of the COUNT () function and quickly determine that: Two people, Mike and Susan, have one record each. Two people, John and George, have two

Google JSON style guide, You may see comments in the examples below, // But don't include comments in your JSON. A map (also referred to as an associative array) is a data type with arbitrary key/value pairs in other words, each reserved property may appear zero or one times. The specific details of the id property are left up to the service. 1. Select a blank cell for locating the result, then click Kutools > Formulas > Count times a word appears.

Comments
  • Possible duplicate of How to count string occurrence in string?
  • is there a way to make this so that "m.name" will add 'acc' variable by 1 even if the name is "johndoe 123", "johndoe", and "johndoe!" ? So that it doesn't specifically check for the object that only has the name "johndoe" and there is more flexibility