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 vote107 views1 answer
Aading two floating points in nasm assembly grepper
TypeScript
0 vote107 views1 answer
How many sets of 3 in 4
TypeScript
2 votes100 views1 answer
Mat-form-field email validation
TypeScript
6 votes106 views1 answer
Comments pycharm
TypeScript
7 votes108 views5 answers
Reactnative typescript
TypeScript
1 vote98 views1 answer
Create class angular
TypeScript
1 vote125 views1 answer
Change textinputlayout color
TypeScript
0 vote109 views1 answer
Are remote objects and distributed objects the same
TypeScript
1 vote115 views2 answers
When i console log a obj its printing object
TypeScript
5 votes117 views2 answers
Typescript css variables html
TypeScript