Map vs for each

chars = ['Hello' , 'world!!!'] ;
var retVal = chars.forEach(function(word){
  console.log("Saving to db: " + word) 
})
console.log(retVal) //undefined

chars = ['Hello' , 'world!!!'] ;
var lengths = chars.map(function(word){
  return word.length
}) 
console.log(lengths) //[5,8]

Source: stackoverflow.com

Similar codes

0 vote282 views1 answer
Take two inputs from user and add them using callback function
TypeScript
0 vote288 views1 answer
Adding API request
TypeScript
2 votes341 views1 answer
How to delete all elements from hashmap in java except one
TypeScript
0 vote289 views1 answer
How to display dotted line betweens 2 series point in high charts react native
TypeScript
2 votes298 views2 answers
Useful python scripts for translators of texts
TypeScript
0 vote301 views1 answer
Capitalize first letter of all word typescript
TypeScript
0 vote292 views1 answer
Async http requests python - Aiohttp
TypeScript
0 vote299 views1 answer
Number validation in typescript
TypeScript
3 votes287 views3 answers
How to get value from autocomplete material ui
TypeScript
0 vote290 views1 answer
Call appply bind
TypeScript