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

By Wild WhaleWild Whale on Jul 10, 2020
var lengths = chars.map(function(word){
 return word.length
}) 

Source: stackoverflow.com

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

By Wild WhaleWild Whale on Jul 10, 2020
var words = ['Hello', 'world'];

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

console.log(lengths);

Source: stackoverflow.com

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typescript count array condition

By Elated EelElated Eel on Oct 23, 2020
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)

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