Let say I have a 5 objects like so in an array:
var myObjects = [{a: 1, b: 2}, {a: 3, b: 4}, {a: 1, b: 6}, {a: 3, b: 8}, {a: 1, b: 9}];
How can I iterate though this myObjects and get objects having similar value a = 1. eg. {a: 1, b: 2},{a: 1, b: 6},{a: 1, b: 9} as a result?
var result = myObjects.filter(function(e) {
return e.a === 1;
});
MDN provides a polyfill for old browsers which don't support this method.
If you want to group objects based on property a, then you may use the following approach:
var result = {};
for (var i = 0, len = myObjects.length; i < len; i++) {
var obj = myObjects[i];
if (result[obj.a] === undefined) {
result[obj.a] = [];
}
result[obj.a].push(obj);
}
console.log(result);
Extending on @VisioN's answer: You can use a factory function that itself returns a function to filter by:
function filterAByValue(value) {
return function(item) {
return item.a === value;
};
}
var result = myObjects.filter(filterAByValue(1));
Or even make the property variable:
function filterPropertyByValue(property, value) {
return function(item) {
return item[property] === value;
};
}
var result = myObjects.filter(filterPropertyByValue("a", 1));
Try this
var index[];
for(i=0;i<obj.lenght;i++)
{
if(obj[i].a==1)
{
index.push(i);
//you even can push obj[i] to some other array and use it
}
}
ato search for then provide an example of the result you expecta... so what is the rule to filter value = 1? How should the code know to remove a = 3? they won't be removed by magic, you need to define your rules. Why shouldn't the result be{a: 3, b: 4}, {a: 3, b: 8}for example?