to-obj
v0.3.4
Published
Array/object to object converter
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to-obj
Supersmall array/object to plain old javascript object converter. Compatible with CommonJS / SystemJS / AMD.
Install
npm install --save to-obj
Object from Array
Like Object.assign({}, array)
:
const arr = ['a', 'b'];
toObj(arr); // { 0: 'a', 1: 'b' }
With value provided:
const arr = ['a', 'b'];
toObj(arr, 'value'); // { a: 'value', b: 'value' }
toObj(arr, undefined); // { a: undefined, b: undefined }
With values from array:
const arr = ['a', 'b'];
toObj(arr, [1, 2]); // { a: 1, b: 2 }
With transformer function:
const arr = ['a', 'b'];
const transformer = (value, index) => value + '-' + index;
toObj(arr, transformer); // { a: 'a-0', b: 'b-1' }
Object from athother object
Returns shallow copy of given object:
const obj = { a: 3, b: 4 };
const newObject = toObj(obj);
newObject; // { a: 3, b: 4 }
obj === newObj; // false
With value provided:
const obj = { a: 3, b: 4 };
toObj(obj, 'something'); // { a: 'something', b: 'something' }
With transformer function:
const obj = { a: 3, b: 4 };
const transformer = (value, key) => key + '-' + value;
toObj(obj, transformer); // { a: 'a-3', b: 'b-4' }
Also works with object-like values:
const func = function() {};
func.test = 1;
func.t = 2;
toObj(func); // { test: 1, t: 2 }
toObj(func, null); // { test: null, t: null }
toObj.byKey
If you have array of users:
const users = [
{ id: 111, name: 'bob' },
{ id: 222, name: 'den' },
];
and you want to convert it to dictionary of users by id
, just provide key or function returning key:
const toObjById = toObj.byKey((user, index) => user.id);
// Or (shortcut):
const toObjById = toObj.byKey('id');
toObjById(users); // {
// 111: { id: 111, name: 'bob' },
// 222: { id: 222, name: 'dan' }
// }
This works as described before, for example, lets take object of users:
const users = {
z: { id: 111, name: 'bob' },
x: { id: 222, name: 'den' },
};
// second argument does the same thing described in “With transformer function”:
toObjById(users, user => user.name); // {
// 111: 'bob',
// 222: 'dan',
// }