I am dealing with the string:
"0,2,4,5,6"
How can I verify if these numbers exist in an array?
let daysweek = [
{ id: '0', name: 'Sunday' },
{ id: '1', name: 'Monday' },
{ id: '2', name: 'Tuesday' },
];
I am dealing with the string:
"0,2,4,5,6"
How can I verify if these numbers exist in an array?
let daysweek = [
{ id: '0', name: 'Sunday' },
{ id: '1', name: 'Monday' },
{ id: '2', name: 'Tuesday' },
];
Develop a set containing the IDs from the array daysofweek, enabling easy verification of whether an ID exists in the set.
let daysweek = [
{ id: '0', name: 'Sunday' },
{ id: '1', name: 'Monday' },
{ id: '2', name: 'Tuesday' },
];
let days = "0,2,4,5,6";
let set = new Set(daysweek.map( item => item.id ))
let found_days = days.split(",").filter( day => set.has(day) );
console.log(found_days);
This solution runs in O(N) time complexity. In comparison, AlwaysHelping's and MarkCBall's solutions have a time complexity of O(N^2), which can lead to significantly slower performance as the size of the daysweek array grows.
If you want to extract ids from a string and compare them with a predefined list of ids, you can use the Array#map method along with the split function.
The split() function will split the string and convert it into an array, removing any commas.
By using map, you can extract all the ids and store them in a variable. Then, you can compare these ids with the strings you have using the Array#forEach method.
Live Example:
let daysOfWeek = [{
id: '0',
name: 'Sunday'
},
{
id: '1',
name: 'Monday'
},
{
id: '2',
name: 'Tuesday'
},
];
let str = "0,2,4,5,6".split(',') // Split the string
let daysID = daysOfWeek.map(day => day.id) // Store the ids
str.forEach(function(x){
let found = daysID.includes(x)
console.log(x + " = " +found) // Display true or false for each found id
})const weekDays = [
{ id: '0', name: 'Sunday' },
{ id: '1', name: 'Monday' },
{ id: '2', name: 'Tuesday' },
];
const daysOfWeekIds = weekDays.map(obj=>obj.id)
const numsInArray = "0,2,4,5,6".split(",").every(num=>daysOfWeekIds.includes(num))
console.log(numsInArray)
I want to express my gratitude to everyone, as I have come across an example that fits perfectly with what I was looking for
daysweek2 = [
'Sunday',
'Monday',
'Tuesday',
'Wednesday',
'Thursday',
'Friday',
'Saturday',
];
function initializeDays() {
return "0,2,4".split(',')
.map(key => this.daysweek2[key]).join(',').split(',')
}
console.log(this.initializeDays());
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