How can I create a function that check boolean field in array of object javascript

Question

The final goal: if all the field are true the last object.field must change to true

const badges = [

  { name: "peter", given : true, points: 10 },
    { name: "Alice", given : true,  points: 100 },
    { name: "Hugo", given: true,  points: 100 },
    { name: "Salah", given: false,  points: 500 },
    { name: "Rui", given: false, points: 1000 },
    { name: "Jimena", given: false,  points: 10000 }

]

My code:

const badges = [
    { name: "peter", given : true, points: 10 },
    { name: "Alice", given : true,  points: 100 },
    { name: "Hugo", given: true,  points: 100 },
    { name: "Salah", given: false,  points: 500 },
    { name: "Rui", given: false, points: 1000 },
    { name: "Jimena", given: false,  points: 10000 }
]

let count = 0
badges.forEach((ele, index) => {
  const l = badges.length
  ele.given === true ? count = count + 1 : count
  count == l - 1 ? badges[l - 1].given = true : badges[l - 1].given
})

console.log(badges)

What I would like to achieve: is a more generic function that can works anywhere but I could not find the way or maybe a simplest way.

Jamiec · Accepted Answer · 2021-02-01 09:32:46Z

4

This will work so long as the field provided is a boolean. Makes use of slice to get everything but the last element and every to check all those conform to a condition.

const badges = [

  { name: "peter", given : true, points: 10 },
    { name: "Alice", given : true,  points: 100 },
    { name: "Hugo", given: true,  points: 100 },
    { name: "Salah", given: true,  points: 500 },
    { name: "Rui", given: true, points: 1000 },
    { name: "Jimena", given: false,  points: 10000 }

]

function check(input, field) {
  var result = input.slice(0,input.length-1).every(x => x[field]);
  if(result) {
    badges[input.length-1][field] = true;
  }
}

check(badges,"given");
console.log(badges)

answered Feb 1, 2021 at 9:32

Jamiec

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4 Comments

foxDev Over a year ago

I am trying to understand better your code, please can you tell me if x[field] and x.fieldis the same in this case? and why when I do a console.log(badges[input.length-1][field]) inside a function it's have a different value from doing it out side?thanks

Jamiec Over a year ago

Yes x.field and x["field"] are the same, although the latter allows you to reference the field using a string (see "square bracket notation"). Your second question is unclear. Do you mean before or after calling check in this example? That method is updating a value

foxDev Over a year ago

you mean badges[index][field]? if I use it out side the function scope it's not working, I m just trying to understand the code to use it in another function in the future, do you have any link to information to understand better how to use iteration in array of objects?.@jamiec

Jamiec Over a year ago

@foxDev developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… might help you understand

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