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

1 vote339 views1 answer
Smooth scroll in viewportscroller
TypeScript
0 vote345 views1 answer
Edit lights in a room alexa
TypeScript
7 votes352 views2 answers
Remote events roblox
TypeScript
189 votes431 views27 answers
Reduce javascript
TypeScript
0 vote319 views1 answer
Check if username exists in database django
TypeScript
0 vote318 views1 answer
Angular type of string
TypeScript
0 vote323 views1 answer
Property 'editor' does not exist on type 'Window & typeof globalThis'.
TypeScript
0 vote320 views1 answer
Fechas - Solución resta un día en dato
TypeScript
8 votes346 views5 answers
Property 'value' does not exist on type 'EventTarget & Element'.
TypeScript
2 votes325 views1 answer
Session not created: This version of ChromeDriver only supports Chrome version 85
TypeScript