/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 vote356 views1 answer
Typeorm @unique
TypeScript
2 votes339 views1 answer
Laravel model dont exists id
TypeScript
0 vote318 views3 answers
Overlayscrollbars-react
TypeScript
14 votes329 views3 answers
Typescript pick
TypeScript
0 vote339 views2 answers
Ts class
TypeScript
0 vote330 views1 answer
Window open blob
TypeScript
0 vote374 views1 answer
What are the common mistakes in testing
TypeScript
1 vote350 views1 answer
Ion slides updateAutoHeight
TypeScript
0 vote363 views1 answer
S'entrainer pour tests techniques developpeurs web
TypeScript
2 votes331 views1 answer
Create model class angular
TypeScript