/TypeScript/Typescript count array condition

Typescript count array condition

Use .map to count length of each element in an array

var lengths = chars.map(function(word){
 return word.length
})

Source: stackoverflow.com

Use .map to count length of each element in an array

var words = ['Hello', 'world'];

var lengths = words.map(function(word) {
  return word + ' = ' + word.length;
});

console.log(lengths);

Source: stackoverflow.com

Typescript count array condition

let data = [ { "id": 1, "is_read": true, }, { "id": 2, "is_read": true, }, { "id": 3, "is_read": false, }, { "id": 4, "is_read": true, }, ],
length = data.filter(function(item){
  return item.is_read;
}).length;
console.log(length)

-2

Similar codes

0 vote201 views1 answer
Function in c that converts current time in timezone
TypeScript
5 votes343 views1 answer
Sqlite3.ProgrammingError: SQLite objects created in a thread can only be used in that same thread
TypeScript
2 votes207 views2 answers
Print digits of a number in c
TypeScript
6 votes198 views1 answer
File C:\Users\SHUBHAM KUNWAR\AppData\Roaming\npm\nodemon.ps1 cannot be loaded because running scripts is disabled on this system. For more information, see about_Execution_Policies at https:/go.microsoft.com/fwlink/?LinkID=135170.
TypeScript
0 vote200 views1 answer
Replace floats in dataframe
TypeScript
0 vote261 views1 answer
Calling funcionts in bash
TypeScript
0 vote290 views1 answer
Pandas value_counts multiple columns
TypeScript
2 votes232 views5 answers
Plot multiple plots in r
TypeScript
0 vote191 views1 answer
Mat-checkbox change
TypeScript
0 vote234 views1 answer
How to loop the jquery formData key object in jqueyr
TypeScript