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 vote115 views1 answer
They Take Their Medication Then The Device Owner Lets Them Press The Button | The Problem We Are Solving Is Kids Not Taking Their Medication Which Turns To Great Health Benefits In The Young Generation
TypeScript
2 votes111 views2 answers
How to find a combination of all elements in a python list
TypeScript
1 vote176 views1 answer
Dataframe value counts sort
TypeScript
1 vote115 views1 answer
Nuxt "AxiosRequestConfig"
TypeScript
1 vote118 views2 answers
Dart clone list
TypeScript
0 vote122 views1 answer
Create an object bottle that has a property that is an object: cap. cap can have properties like material: 'metal' or 'plastic', color: blue or white etc. Log one of the properties of that inner object.
TypeScript
0 vote108 views1 answer
See tsv in format on command line
TypeScript
-1 vote125 views1 answer
Fwrite() expects parameter 2 to be string, array given
TypeScript
0 vote112 views2 answers
Get elements of array matlab
TypeScript
1 vote113 views1 answer
Find value in array ts
TypeScript