I have a Typescript project in which I have an array of objects from which I want to extract the value of a key where another value matches the local variable.
I need to get the value of sheetId of the object where the value of title is equal to the value of fileName
This is my object:
let list = [
{
"properties": {
"sheetId": 1000297558,
"title": "ser"
}
},
{
"properties": {
"sheetId": 24134863,
"title": "atr"
}
},
{
"properties": {
"sheetId": 668935915,
"title": "work"
}
}
]
This is the variable:
let fileName = 'atr'
This is what I want to get:
let testId = 24134863
This is what I am doing, but I only get it to show me true in the object that matches, but I don't know how to extract the key:
let sheetFile = list.map((elem: any) => elem.properties.title == fileName)
Update:
This is what I'm doing to find the value of sheetId:
let sheetId: number = list.find((elem: any) => elem.properties.title == fileName).properties.sheetId
This is the error it shows:
Error: Cannot read properties of undefined (reading 'properties')
My problem: how can I control that undefined or how can I assign it a 0, for example so that it has a value
You need to use .find method to find and extract your value with dot notation.
const fileName = 'atr'
const list = [
{
"properties": {
"sheetId": 1000297558,
"title": "ser"
}
},
{
"properties": {
"sheetId": 24134863,
"title": "atr"
}
},
{
"properties": {
"sheetId": 668935915,
"title": "work"
}
}
]
const result = list.find((item) => item.properties.title === fileName).properties.sheetId;
console.log(result);First, you have to filter to find matches.
After that, extract (with map) from the previous matches.
let list = [
{
"properties": {
"sheetId": 1000297558,
"title": "ser"
}
},
{
"properties": {
"sheetId": 24134863,
"title": "atr"
}
},
{
"properties": {
"sheetId": 668935915,
"title": "work"
}
}
]
let fileName = 'atr'
let testId = 24134863
let sheetFile = list
.filter((elem) => elem.properties.title == fileName)
.map((elem) => elem.properties.sheetId)
console.log(sheetFile)