feat(curriculum): add Build an All-True Property Validator lab (#62198)

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Sem Bauke <sem@freecodecamp.org>
This commit is contained in:
Ilenia
2025-09-25 16:29:14 +02:00
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parent 57c515e230
commit 6c3bc14f52
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"In this lab you will create a function that can flatten deeply nested arrays, handling any level of nesting without using built-in flat methods."
]
},
"lab-all-true-property-validator": {
"title": "Build an All-True Property Validator",
"intro": [
"In this lab you will build a function that checks if all objects in an array have a truthy value for a specific property."
]
},
"review-javascript-higher-order-functions": {
"title": "JavaScript Higher Order Functions Review",
"intro": [

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---
title: Introduction to the Build an All-True Property Validator
block: lab-all-true-property-validator
superBlock: full-stack-developer
---
## Introduction to the Build an All-True Property Validator
For this lab, you will create a function that validates whether all objects in an array have a truthy value for a specific property.

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---
id: a10d2431ad0c6a099a4b8b52
title: Build an All-True Property Validator
challengeType: 26
dashedName: build-an-all-true-property-validator
---
# --description--
In this lab you will test a specific property of each object in an array to see if it always has a truthy value or not.
For example, you could be asked to test one property of the objects in an array like the following:
```js
[{
name: "Quincy",
role: "Founder",
isBot: false
}, {
name: "Naomi",
role: "",
isBot: false
}, {
name: "Camperbot",
role: "Bot",
isBot: true
}]
```
If you were asked to test the `name` property, in the objects of this array the property `name` has the values of `"Quincy"`, `"Naomi"`, and `"Camperbot"`, so it is always truthy.
If you were asked to test the `role` property, the values are `"Founder"`, `""`, and `"Bot"`, in this case `""` is a falsy value, so the values are not always truthy.
**Objective:** Fulfill the user stories below and get all the tests to pass to complete the lab.
**User Stories:**
1. You should have a function named `truthCheck`.
1. The `truthCheck` function takes two arguments: an array of objects and a string representing a property name found in those objects.
1. The function should check if the property with the name equal to the second argument has a truthy value in all the objects of the array, and return `true` if it has, and `false` otherwise.
# --hints--
`truthCheck([{name: "Quincy", role: "Founder", isBot: false}, {name: "Naomi", role: "", isBot: false}, {name: "Camperbot", role: "Bot", isBot: true}], "isBot")` should return `false`.
```js
assert.strictEqual(truthCheck(
[
{ name: "Quincy", role: "Founder", isBot: false },
{ name: "Naomi", role: "", isBot: false },
{ name: "Camperbot", role: "Bot", isBot: true }
],
"isBot"), false);
```
`truthCheck([{name: "Quincy", role: "Founder", isBot: false}, {name: "Naomi", role: "", isBot: false}, {name: "Camperbot", role: "Bot", isBot: true}], "name")` should return `true`.
```js
assert.strictEqual(truthCheck(
[
{ name: "Quincy", role: "Founder", isBot: false },
{ name: "Naomi", role: "", isBot: false },
{ name: "Camperbot", role: "Bot", isBot: true }
],
"name"), true);
```
`truthCheck([{name: "Quincy", role: "Founder", isBot: false}, {name: "Naomi", role: "", isBot: false}, {name: "Camperbot", role: "Bot", isBot: true}], "role")` should return `false`.
```js
assert.strictEqual(truthCheck(
[
{ name: "Quincy", role: "Founder", isBot: false },
{ name: "Naomi", role: "", isBot: false },
{ name: "Camperbot", role: "Bot", isBot: true }
],
"role"), false);
```
`truthCheck([{name: "Pikachu", number: 25, caught: 3}, {name: "Togepi", number: 175, caught: 1}], "number")` should return `true`.
```js
assert.strictEqual(truthCheck(
[
{ name: "Pikachu", number: 25, caught: 3 },
{ name: "Togepi", number: 175, caught: 1 },
],
"number"), true);
```
`truthCheck([{name: "Pikachu", number: 25, caught: 3}, {name: "Togepi", number: 175, caught: 1}, {name: "MissingNo", number: NaN, caught: 0}], "caught")` should return `false`.
```js
assert.strictEqual(truthCheck(
[
{ name: "Pikachu", number: 25, caught: 3 },
{ name: "Togepi", number: 175, caught: 1 },
{ name: "MissingNo", number: NaN, caught: 0 },
],
"caught"), false);
```
`truthCheck([{name: "Pikachu", number: 25, caught: 3}, {name: "Togepi", number: 175, caught: 1}, {name: "MissingNo", number: NaN, caught: 0}], "number")` should return `false`.
```js
assert.strictEqual(truthCheck(
[
{ name: "Pikachu", number: 25, caught: 3 },
{ name: "Togepi", number: 175, caught: 1 },
{ name: "MissingNo", number: NaN, caught: 0 },
],
"number"), false);
```
`truthCheck([{name: "Quincy", username: "QuincyLarson"}, {name: "Naomi", username: "nhcarrigan"}, {name: "Camperbot"}], "username")` should return `false`.
```js
assert.strictEqual(truthCheck(
[
{ name: "Quincy", username: "QuincyLarson" },
{ name: "Naomi", username: "nhcarrigan" },
{ name: "Camperbot" }
],
"username"), false);
```
`truthCheck([{name: "freeCodeCamp", users: [{name: "Quincy"}, {name: "Naomi"}]}, {name: "Code Radio", users: [{name: "Camperbot"}]}, {name: "", users: []}], "users")` should return `true`.
```js
assert.strictEqual(truthCheck(
[
{ name: "freeCodeCamp", users: [{ name: "Quincy" }, { name: "Naomi" }] },
{ name: "Code Radio", users: [{ name: "Camperbot" }] },
{ name: "", users: [] },
],
"users"), true);
```
`truthCheck([{id: 1, data: {url: "https://freecodecamp.org", name: "freeCodeCamp"}}, {id: 2, data: {url: "https://coderadio.freecodecamp.org/", name: "CodeRadio"}}, {id: null, data: {}}], "data")` should return `true`.
```js
assert.strictEqual(truthCheck(
[
{ id: 1, data: { url: "https://freecodecamp.org", name: "freeCodeCamp" } },
{ id: 2, data: { url: "https://coderadio.freecodecamp.org/", name: "CodeRadio" } },
{ id: null, data: {} },
],
"data"), true);
```
`truthCheck([{id: 1, data: {url: "https://freecodecamp.org", name: "freeCodeCamp"}}, {id: 2, data: {url: "https://coderadio.freecodecamp.org/", name: "CodeRadio"}}, {id: null, data: {}}], "id")` should return `false`.
```js
assert.strictEqual(truthCheck(
[
{ id: 1, data: { url: "https://freecodecamp.org", name: "freeCodeCamp" } },
{ id: 2, data: { url: "https://coderadio.freecodecamp.org/", name: "CodeRadio" } },
{ id: null, data: {} },
],
"id"), false);
```
# --seed--
## --seed-contents--
```js
function truthCheck(collection, pre) {
return pre;
}
truthCheck([{name: "Quincy", role: "Founder", isBot: false}, {name: "Naomi", role: "", isBot: false}, {name: "Camperbot", role: "Bot", isBot: true}], "isBot");
```
# --solutions--
```js
function truthCheck(collection, pre) {
return collection.every(function(e) { return e[pre]; });
}
```

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{
"name": "Build an All-True Property Validator",
"blockType": "lab",
"blockLayout": "link",
"isUpcomingChange": false,
"usesMultifileEditor": true,
"dashedName": "lab-all-true-property-validator",
"challengeOrder": [
{
"id": "a10d2431ad0c6a099a4b8b52",
"title": "Build an All-True Property Validator"
}
],
"helpCategory": "JavaScript"
}

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@@ -410,6 +410,7 @@
"lab-matching-object-filter",
"lab-sum-all-primes-calculator",
"lab-deep-flattening-tool",
"lab-all-true-property-validator",
"review-javascript-higher-order-functions",
"quiz-javascript-higher-order-functions"
]