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I face an issue with a so simple js transformation !
Here is my array
["one", "two"]
Here is what I want to output
["en/one", "en/one", "fr/two", "fr/two"]
What I'm trying to do with my knowledge
let a = ["one", "two"];
let b = a.map(x => `en/${x}`,`fr/${x}`);
console.log(b);
But I get an error:
ReferenceError: x is not defined
How can I make this work?
The way you wrote it, `fr/${x}` becomes a second argument to .map() (where x is not in scope). You need to combine the two values in an array...
And then you can use flatMap:
let b = a.flatMap(x => [`en/${x}`,`fr/${x}`]);
Related
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I have troubles understanding the meaning of (_,idx) in the following statement
arr.filter((_, idx) => idx % 2 === 0)
I understand it is filtering the array and just returning on the new array all elements that respect the condition(basically with even index). But i do not understand what this (_,idx) means?
Any help?
(_, idx) are two variable names.
arr.filter((currentValue, index, array) => )
As you can read here.
So "_" is currentValue and "idx" is the index.
"_" is not use but still defindes because it is a non-optional parameter, so you always have to give it an name.
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I want to create an Array from another by applying the proportionality rule.
For example:
Array1 = [15,550,76,3,400,230]
I take the maximum value from Array1 which is equal in my array 550
Now, with a function, I want to create a second array Array2 with a value equal to 10 which corresponds to 550 in the first array, like Array2 = [?,10,?,?,?,?]
I want to apply the proportionality rule function to determine the other values of Array2 to get Array2=[0.27,10,1.38,0.05,7.27,4.6]
Any help please how can I create the function with array param?
Thank you.
const array1 = [15,550,76,3,400,230]
function proportionalityRule(array){
const maxValue = Math.max(...array)
return array.map(element => (element/maxValue) * 10)
}
proportionalityRule(array1)
// (6) [0.2727272727272727, 10, 1.3818181818181818, 0.05454545454545455, 7.272727272727273, 4.181818181818182]
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Convert
var a = [['12ae11ee12-1bhb222','2019-10-10T19:46.19.632z','a123']]
to
var a= ['12ae11ee12-1bhb222','2019-10-10T19:46.19.632z','a123']
I dont want two square brackets in front and end.
I want output
a[2] = 'a123'
The best way to do is just assigning the first value to the array:
var a = [['12ae11ee12-1bhb222','2019-10-10T19:46.19.632z','a123']];
a = a[0];
console.log(a);
But the right way of dealing it should be making sure that the endpoint or whatever that outputs should output correctly.
You can use Array.prototype.flat().
console.log([['12ae11ee12-1bhb222','2019-10-10T19:46.19.632z','a123']].flat());
This solution works if it's extremely nested too:
console.log([
['12ae11ee12-1bhb222'],
['2019-10-10T19:46.19.632z', 'a123']
].flat());
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I am playing around with immer.js. Immer.js lock obejct after giving new instance. Is it ok to use this locked object as global state?
windows.initialState = {a: 'a'};
const nextState = produce(initialState , draftState => {
draftState.a = 'b',
});
windows.initialState = nextState;
Yes, you can assign and keep the frozen object to the global state. As long as your global object(initial state) is not declared as const. So, Nothing wrongs with this code.
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I have an array like this:
var animals=["cat","dog","snake","rhino"];
But sometimes I have to delete this array(remove it from the dom).
I have tried animals.remove; and $(animals).remove() and animals.remove() but none of them did the trick.Any ideas?
var animals=["cat","dog","snake","rhino"];
then to clear it do:
animals=[];
or
animals.length=0;
or
while(animals.length > 0) {
animals.pop();
}
Just assign the animals array to a value undefined and the array data will be dereferenced and garbage collected.
Donot try to call delete operator that is explicit removal.
animals = undefined
OR
animals = void 0
Thanks
Just Clear The Array
Using This 2 Methods
animals.length =0
animals=[];