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JavaScript - create object from 2d array
1 answers
0 points
How can I convert 2D array to an object?
Let's say I have the following array of key/value pairs:
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[ [ 'a', 1 ], [ 'b', 2 ], [ 'c', 3 ] ]and the result I want to get is:
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var object = {2
a: 1,3
b: 2,4
c: 35
}; 1 answer
0 points
1. Using reduce() method (ES6+)
You can use reduce() method to initialize the accumulator with an empty object which will be returned as a result. Then, on every iteration, assign the current value as the key of the accumulator and set its value. At the end it returns the accumulator object.
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const arrayToObject = (array) => {2
return array.reduce((accumulator, current) => {3
const key = current[0];4
const value = current[1];5
accumulator[key] = value;6
return accumulator;7
}, {});8
};9
10
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// Usage example12
13
const myArray = [14
['a', 1],15
['b', 2],16
['c', 3],17
];18
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const myObject = arrayToObject(myArray);20
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console.log(JSON.stringify(myObject)); // { c: 1, a: 2, b: 3 }2. Alternative solution
As an alternative solution for older versions of JavaScript, you can simply loop through the array, for example using forEach(), to assign the key/value pairs to an empty object and return it at the end.
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function arrayToObject(array) {2
var object = {};3
array.forEach((val) => {4
var key = val[0];5
var value = val[1];6
object[key] = value; // adds key and value to the object7
});8
return object;9
}10
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// Usage example13
14
var myArray = [15
['a', 1],16
['b', 2],17
['c', 3],18
];19
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var myObject = arrayToObject(myArray);21
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console.log(JSON.stringify(myObject)); // { c: 1, a: 2, b: 3 }
References
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