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| /*Intermediate Algorithm Scripting: Everything Be True | |
| Check if the predicate (second argument) is truthy on all elements of a collection (first argument). | |
| In other words, you are given an array collection of objects. | |
| The predicate pre will be an object property and you need to return true if its value is truthy. Otherwise, return false. | |
| https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/everything-be-true | |
| https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean | |
| https://www.sitepoint.com/javascript-truthy-falsy/ | |
| */ | |
| function truthCheck(collection, pre) { | |
| // Is everyone being true? | |
| let toCheck = [...collection]; | |
| let truthy = true; | |
| toCheck.forEach(obj => { | |
| if (!obj.hasOwnProperty(pre) || !Boolean(obj[pre])){ | |
| truthy = false; | |
| } | |
| }); | |
| return truthy; | |
| } | |
| truthCheck([{"user": "Tinky-Winky", "sex": "male"}, {"user": "Dipsy"}, {"user": "Laa-Laa", "sex": "female"}, {"user": "Po", "sex": "female"}], "sex"); | |
| /* | |
| truthCheck([{"user": "Tinky-Winky", "sex": "male"}, {"user": "Dipsy", "sex": "male"}, {"user": "Laa-Laa", "sex": "female"}, {"user": "Po", "sex": "female"}], "sex") should return true. | |
| Passed | |
| truthCheck([{"user": "Tinky-Winky", "sex": "male"}, {"user": "Dipsy"}, {"user": "Laa-Laa", "sex": "female"}, {"user": "Po", "sex": "female"}], "sex") should return false. | |
| Passed | |
| truthCheck([{"user": "Tinky-Winky", "sex": "male", "age": 0}, {"user": "Dipsy", "sex": "male", "age": 3}, {"user": "Laa-Laa", "sex": "female", "age": 5}, {"user": "Po", "sex": "female", "age": 4}], "age") should return false. | |
| Passed | |
| truthCheck([{"name": "Pete", "onBoat": true}, {"name": "Repeat", "onBoat": true}, {"name": "FastFoward", "onBoat": null}], "onBoat") should return false | |
| Passed | |
| truthCheck([{"name": "Pete", "onBoat": true}, {"name": "Repeat", "onBoat": true, "alias": "Repete"}, {"name": "FastFoward", "onBoat": true}], "onBoat") should return true | |
| Passed | |
| truthCheck([{"single": "yes"}], "single") should return true | |
| Passed | |
| truthCheck([{"single": ""}, {"single": "double"}], "single") should return false | |
| Passed | |
| truthCheck([{"single": "double"}, {"single": undefined}], "single") should return false | |
| Passed | |
| truthCheck([{"single": "double"}, {"single": NaN}], "single") should return false | |
| Passed | |
| */ |
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