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 vote135 views2 answers
.env typescript
TypeScript
2 votes131 views2 answers
Change url param angular
TypeScript
0 vote154 views1 answer
Export const typescript
TypeScript
0 vote217 views1 answer
Typescript vite static assets
TypeScript
2 votes141 views2 answers
Laravel custom exists rule
TypeScript
0 vote139 views2 answers
Drop a column if it exists from dataframe
TypeScript
2 votes153 views1 answer
Multer s3
TypeScript
1 vote147 views3 answers
An attempt was made to access a socket in a way forbidden by its access permissions
TypeScript
0 vote146 views1 answer
Disable sonar rule in code
TypeScript
1 vote181 views6 answers
Decode jwt
TypeScript