/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 vote327 views1 answer
Could not resolve all artifacts for configuration ':classpath'.
TypeScript
1 vote317 views1 answer
Cannot find module jquery typescript ionic
TypeScript
1 vote301 views1 answer
Create npm module typescript
TypeScript
0 vote309 views1 answer
Error: either specify it explicitly with --sdk_root= or move this package into its expected location: <sdk>/cmdline-tools/latest/
TypeScript
0 vote306 views1 answer
Wifi disconnects frequently when downloading
TypeScript
8 votes310 views2 answers
See conda enviroments
TypeScript
0 vote306 views2 answers
Typescript to c# converter
TypeScript
7 votes366 views2 answers
Replaceall typescript
TypeScript
1 vote285 views1 answer
2 positional arguments but 3 were given
TypeScript
1 vote309 views1 answer
Input elements should have autocomplete attributes (suggested: "current-password")
TypeScript