I have a following data in JavaScript:
{
'0.Title': 'Title 1',
'0.Detail': 'Detail 1',
'1.Title': 'Title 2',
'1.Detail': 'Detail 2',
'2.Title': 'Title 1',
'2.Detail': 'Detail 1'
}
I want to count how many times the .Title
exist in the key
. No matter its 0.Title
or 1.Title
.
I did like:
let count = 0;
while ('.Title' in fields) { // <--- fields is the above object
count++;
}
console.log(count); // <--- gives 0
You can use a reducer:
const data = { '0.Title': 'Title 1', '0.Detail': 'Detail 1', '1.Title': 'Title 2', '1.Detail': 'Detail 2', '2.Title': 'Title 1', '2.Detail': 'Detail 1' } console.log(Object.keys(data).reduce((acc, curr) => { if(curr.indexOf(".Title");== -1) acc += 1; return acc, }, 0))
You can use Object.keys
which will give an array of keys then use map
to return an array of keys only but changing the case just to make sure that title
or Title
or TITLE
all considered same. Following that you can use filter to take out keys which have title keyword. This will return an array then you can use length
let data = { '0.Title': 'Title 1', '0.Detail': 'Detail 1', '1.Title': 'Title 2', '1.Detail': 'Detail 2', '2.Title': 'Title 1', '2.Detail': 'Detail 1' }; let k = Object.keys(data).map(e => e.toLowerCase()).filter(e => e.includes('title')); console.log(k.length)
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