4
I would like to know the difference between using the angular.forEach
and the function map
javascript.
ex:
angular.forEach(meuArray, function(itens) {...})
meuArray.map(function(itens) {...});
4
I would like to know the difference between using the angular.forEach
and the function map
javascript.
ex:
angular.forEach(meuArray, function(itens) {...})
meuArray.map(function(itens) {...});
7
The map
Javascript will only work in type values Array
, because it is part of your prototype. That is, the map
what you are referring to is Array.prototype.map
.
Already the angular.forEach
(which is a function available only when using the Angularjs framework) works both for Array
as for Object
.
The Array.prototype.map
, additionally, returns mapped values for a new Array
at the end of the iteration. Already the angular.forEach
does not do this, it just runs (the returned value is the same past, no change).
In this example, a new array will be created:
var multipos_de_3 = [1, 2, 3].map(function (value) {
return value * 3;
})
console.log(multipos_de_3);
Already in this, the values will be maintained
var retorno = angular.forEach([1, 2, 3], function (value, key) {
return value * 3;
});
console.log(retorno);
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
2
Actually both functions are from Javasscript. The difference between forEach
and map
is the functionality. forEach
iterates all array values, while the map
returns a new array as it has the mapping feature.
For example this object array:
[{ 'nome', 'João',
'idade', 20
},{ 'nome', 'José',
'idade', 30
}]
To get only the name of these objects, with forEach
would be:
var nomes = [];
array.forEach(function(item){
nomes.push(item.nome);
});
The same operation with map
:
var nomes = array.map(item => item.nome);
Both will return the array:
['João', 'José']
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-1. He is not talking about the
forEach
Javascript, and yes toangular.forEach
.– Wallace Maxters
What is the difference between the
forEach
angular to Javascript @Wallacemaxters?– BrTkCa
My answer already says. It doesn’t exist
forEach
inObject
javascript.– Wallace Maxters
At this point you’re right. I didn’t notice that he’s referring to
forEach
implemented only at the angular. But I will leave my answer because I presented a basic difference the canonical implementation between the two. Thank you :)– BrTkCa