JavaScript Symbol.isConcatSpreadable is a well-known symbol used to configure if a given object should be flattened to its array elements while using the Array.prototype.concat() method.
Syntax:
Array[Symbol.isConcatSpreadable]
Here Array is the array object which is to be flattened to its array elements.
Parameters: This symbol does not accept any parameter.
Return value: This symbol does not return any value.
Example 1: In this example, we will use isConcatSpreadable Property
javascript
// Creating some arraysconst Array1 = [1, 2, 3];const Array2 = [4, 5, 6];// Calling concat() functionlet Array3 = Array1.concat(Array2);// Printing the concatenated arrayconsole.log(Array3);// Calling Symbol.isConcatSpreadable symbolArray2[Symbol.isConcatSpreadable] = false;Array3 = Array1.concat(Array2);// Printing the concatenated array// after calling of Symbol.isConcatSpreadable symbolconsole.log(Array3); |
Output
[ 1, 2, 3, 4, 5, 6 ] [ 1, 2, 3, [ 4, 5, 6, [Symbol(Symbol.isConcatSpreadable)]: false ] ]
Example 2: In this example, we will use isConcatSpreadable Property
javascript
// Creating some arraysconst Array1 = [1, 2, 3];const Array2 = [4, 5, 6];// Calling concat() functionlet Array3 = Array1.concat(Array2);// Printing the concatenated arrayconsole.log(Array3);// Calling Symbol.isConcatSpreadable symbolArray2[Symbol.isConcatSpreadable] = true;Array3 = Array1.concat(Array2);// Printing the concatenated array// after calling of Symbol.isConcatSpreadable symbolconsole.log(Array3); |
Output
[ 1, 2, 3, 4, 5, 6 ] [ 1, 2, 3, 4, 5, 6 ]
Supported Browsers:
- Google Chrome 48 and above
- Firefox 48 and above
- Edge 15 and above
- Opera 35 and above
- Apple Safari 10 and above
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