forEach
forEach(x, callback)
Try it yourself:
| $1 |
numberOfPets = {}
|
|
| $2 |
addPet(n) = numberOfPets[n] = (numberOfPets[n] ? numberOfPets[n]:0 ) + 1;
|
|
| $3 |
forEach(["Dog","Cat","Cat"], addPet)
|
|
| $4 |
numberOfPets
|