I have an array of cars like this:
[{ name:"Toyota Minivan", id:"506" }, { name:"Honda Civic", id:"619" }]
I am trying to check whether the array contains a certain id.
I have tried
var x =!!_.where(cars, {id:'506'}).length;
expecting it to return true if the array contains the id, but it always returns false.
What am I doing here ?
Btw, I don't have to use underscore.js if there is a better way of doing this.
thanks Thomas
Your code does work (once you fix the syntax errors in the object array): http://jsfiddle.net/ArPCa/
var cars = [{ name:"Toyota Minivan", id:"506"}, { name:"Honda Civic", id:"619"}];
var x =!!_.where(cars, {id:'506'}).length;
console.log('value: ' + x);
returns "value: true". So there must be a problem somewhere else.
But, a better way to do this might be some:
var y = _.some(cars, function(c) {
return c.id == '506';
});
I know this is late, but even easier:
var cars = [{ name:"Toyota Minivan", id:"506"}, { name:"Honda Civic", id:"619"}];
function findById(id) {
return _.contains(_.pluck(cars, 'id'), id);
}
Say you have the array arr, and your id, id.
arr.filter(function(elem) { return elem.id == id; });
will return an array with the matching element(s);
You could wrap it in a function like:
function findById(arr, id) {
var filtered = arr.filter(function(elem) { return elem.id == id; });
return filtered && filtered.length ? filtered[0] : null;
}
, potentially doing some other stuff if you weren't happy with the default filtered array.
var obj = [{
name: "Toyota Minivan",
id: "506"
}, {
name: "Honda Civic",
id: "619"
}];
function findCar(id) {
return obj.filter(function (car) {
if (car.id == id) {
return car;
}
});
}
