I create arrays using this method. I want to create fixed-length array that contains only 20 elements.
this.state{
array:[]
}
onInputChange(e){
const name=e.target.value;
this.setState({ array:name })
}
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2 Answers
You can use Array#fill
const arr = Array(20).fill(1)
console.log(arr)This will not be fixed as you can't fix an array's length, but you can do according checks in order not to push anything to this array once created. You can create a fixed Object however, using Object.seal
UPDATE:
Apparently, you can use Object.seal() on arrays too:
const object1 = Array(10).fill(0)
Object.seal(object1);
object1[2] = 24;
console.log(object1)
object1.push(8)
console.log(object1)
object1.pop()
console.log(object1)And if you use Object.freeze() it also doesn't allow any changes in the array. You can still change the values of indices using seal()
Comments
Well if you're trying to test something in JSX or just to print there a fixed number of elements, this is great and worked for me. Hopefully, this will help you.
{Array.from({length:3}).map((element,index) => <p>{element} {index} </p>)}
