I have a Vue app that gets a JSON object like below. I need to count the number of items where _Valid is true. I have very little experience with the Reduce method in Javascript and don't know how to filter on a portion of a key name. Where do I begin? Is this possible?
{
"F_Mountain1_Week": "1",
"F_Mountain1_Date": "2021-11-12",
"F_Mountain1_Valid": true,
"F_Mountain2_Week": "1",
"F_Mountain2_Date": "2021-11-12",
"F_Mountain2_Valid": true,
"F_Mountain3_Week": "1",
"F_Mountain3_Date": "2021-11-12",
"F_Mountain3_Valid": true,
"F_Mountain4_Week": "",
"F_Mountain4_Date": "2021-11-12",
"F_Mountain4_Valid": false,
"F_Mountain5_Week": "",
"F_Mountain5_Date": "2021-11-12",
"F_Mountain5_Valid": false,
"F_Mountain6_Week": "",
"F_Mountain6_Date": "2021-11-12",
"F_Mountain6_Valid": false,
"F_Mountain7_Week": "",
"F_Mountain7_Date": "2021-11-12",
"F_Mountain7_Valid": false,
"F_Mountain8_Week": "",
"F_Mountain8_Date": "2021-11-12",
"F_Mountain8_Valid": false,
}
This would also work
Using entries and filter. First, get the key and value pairs and then filter using the condition based on value and key properties.
let data = {
F_Mountain1_Week: "1",
F_Mountain1_Date: "2021-11-12",
F_Mountain1_Valid: true,
F_Mountain2_Week: "1",
F_Mountain2_Date: "2021-11-12",
F_Mountain2_Valid: true,
F_Mountain3_Week: "1",
F_Mountain3_Date: "2021-11-12",
F_Mountain3_Valid: true,
F_Mountain4_Week: "",
F_Mountain4_Date: "2021-11-12",
F_Mountain4_Valid: false,
F_Mountain5_Week: "",
F_Mountain5_Date: "2021-11-12",
F_Mountain5_Valid: false,
F_Mountain6_Week: "",
F_Mountain6_Date: "2021-11-12",
F_Mountain6_Valid: false,
F_Mountain7_Week: "",
F_Mountain7_Date: "2021-11-12",
F_Mountain7_Valid: false,
F_Mountain8_Week: "",
F_Mountain8_Date: "2021-11-12",
F_Mountain8_Valid: false
};
console.log(
Object.entries(data).filter(([key, value]) => key.endsWith("_Valid") && value)
.length
);
You can just loop over the array using reduce and calculate the number of properties that endsWith _Valid and which is true as:
Object.keys(obj).reduce((acc, curr) => curr.endsWith("_Valid") && obj[curr] ? acc + 1 : acc, 0)
or you can also use filter here as:
Object.keys(obj).filter((k) => k.endsWith("_Valid") && obj[k]).length;
const obj = {
F_Mountain1_Week: "1",
F_Mountain1_Date: "2021-11-12",
F_Mountain1_Valid: true,
F_Mountain2_Week: "1",
F_Mountain2_Date: "2021-11-12",
F_Mountain2_Valid: true,
F_Mountain3_Week: "1",
F_Mountain3_Date: "2021-11-12",
F_Mountain3_Valid: true,
F_Mountain4_Week: "",
F_Mountain4_Date: "2021-11-12",
F_Mountain4_Valid: false,
F_Mountain5_Week: "",
F_Mountain5_Date: "2021-11-12",
F_Mountain5_Valid: false,
F_Mountain6_Week: "",
F_Mountain6_Date: "2021-11-12",
F_Mountain6_Valid: false,
F_Mountain7_Week: "",
F_Mountain7_Date: "2021-11-12",
F_Mountain7_Valid: false,
F_Mountain8_Week: "",
F_Mountain8_Date: "2021-11-12",
F_Mountain8_Valid: false,
};
const result = Object.keys(obj).reduce((acc, curr) => curr.endsWith("_Valid") && obj[curr] ? acc + 1 : acc, 0);
console.log(result);let data = {
F_Mountain1_Week: "1",
F_Mountain1_Date: "2021-11-12",
F_Mountain1_Valid: true,
F_Mountain2_Week: "1",
F_Mountain2_Date: "2021-11-12",
F_Mountain2_Valid: true,
F_Mountain3_Week: "1",
F_Mountain3_Date: "2021-11-12",
F_Mountain3_Valid: true,
F_Mountain4_Week: "",
F_Mountain4_Date: "2021-11-12",
F_Mountain4_Valid: false,
F_Mountain5_Week: "",
F_Mountain5_Date: "2021-11-12",
F_Mountain5_Valid: false,
F_Mountain6_Week: "",
F_Mountain6_Date: "2021-11-12",
F_Mountain6_Valid: false,
F_Mountain7_Week: "",
F_Mountain7_Date: "2021-11-12",
F_Mountain7_Valid: false,
F_Mountain8_Week: "",
F_Mountain8_Date: "2021-11-12",
F_Mountain8_Valid: false
};
for (var prop in data) {
if (typeof data[prop] == 'function') continue;
if(/_Valid$/.test(prop) && data[prop] === true) {
console.log('BAZINGA!')
} else {
console.log('I DON\'T CARE ABOUT THIS PROP:\n')
console.log(`Property name: ${prop} - Value: ${data[prop]}`);
}
}