Here my array :
[{id: 1, value:'blabla'}, {id: 2, value:'blabla'}, {id: 3, value:'blabla'}]
I try to return true or false if an id is present in this array :
array.includes(2) -> true
array.includes(7) -> false
I need to do this on the id index of each object of the array.
I know i can use a foreach on each id of the array, but i want to use a cleanest way to do this. What can i use ? Thanks !
Operating Array.prototype.some directly at the given array, one can write ...
array.some(({ id }) => id === yourID)
... or one uses a more generic approach like ...
var array = [
{ id: 1, value: 'blabla' },
{ id: 2, value: 'blabla' },
{ id: 3, value: 'blabla' },
];
function hasItemWithKeyAndValue(arr, key, value) {
return arr.some(item => item[key] === value);
}
// what the OP did ask for.
console.log(
"hasItemWithKeyAndValue(array, 'id', 1) ?", // true
hasItemWithKeyAndValue(array, 'id', 1)
);
console.log(
"hasItemWithKeyAndValue(array, 'id', '1') ?", // false
hasItemWithKeyAndValue(array, 'id', '1')
);
console.log(
"hasItemWithKeyAndValue(array, 'id', 3) ?", // true
hasItemWithKeyAndValue(array, 'id', 3)
);
console.log(
"hasItemWithKeyAndValue(array, 'id', 4) ?", // false
hasItemWithKeyAndValue(array, 'id', 4)
);
// proof of the generic key value approach.
console.log(
"hasItemWithKeyAndValue(array, 'value', 'blabla') ?", // true
hasItemWithKeyAndValue(array, 'value', 'blabla')
);.as-console-wrapper { min-height: 100%!important; top: 0; }
array.some(({id}) => id === yourId).You can use Array.some():
let arr = [{id: 1, value:'blabla'}, {id: 2, value:'blabla'}, {id: 3, value:'blabla'}];
arr.some(e => e.id === 1);
// -> true
If you want an approach like Array.includes() you can extend the Array prototype:
let arr = [{id: 1, value:'blabla'}, {id: 2, value:'blabla'}, {id: 3, value:'blabla'}];
Array.prototype.hasId = function(id){
return this.some(e => e.id === id);
};
console.log(arr.hasId(1));
console.log(arr.hasId(3));
console.log(arr.hasId(4));Otherwise I'd just wrap it inside a function:
let arr = [{id: 1, value:'blabla'}, {id: 2, value:'blabla'}, {id: 3, value:'blabla'}];
let hasId = function(arr, id){
return arr.some(e => e.id === id);
};
console.log(hasId(arr, 1));
console.log(hasId(arr, 2));
console.log(hasId(arr, 4));
somestart an approach and ask again if anything still remains unclear.ObjectandArraymethods (both static and on prototype).