Get the splice parameter that converts array A to array B [closed] - javascript

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I want to write a method to turn array A into array B by a single splice operation, returning the format [index, deleteCount, . . items], which can be used to add or delete elements, but I need to make sure that the minimum number of elements is reached in each operation.
For example, if array A is [1, 2, 2, 3] and array B is [1, 2, 5, 3], then the return result is [2,1,5].

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Can map function in JS do multiple transformations at once? [closed]

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I wonder whether a map-function in JavaScript can do more than one transformation to an array at once.
For instance, can the items of an array be transformed to be doubled AND then to be divided by 3?
Thank you
If you want to make multiple transformations to an array element at once all you have to do is use parenthesis to separate and have them be done in a certain order.
For your example, you could do it like this:
var array = [1, 2, 3, 4];
array.map(num => (num * 2) / 3);
Which would give you
[0.6666666666666666, 1.3333333333333333, 2, 2.6666666666666665]

JavaScript : How create proportionality rule function with array parameter [closed]

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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]

How to compare length of three array? Javascript [closed]

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I need to return false or alert or console.log('no true') if three list there is not the same number of items?
example
arrOne = [1,2,3];
arrTwo = [5,6,7];
arrTthree = [1,9];
FALSE arrThree has 2 values , one and two have 3 values.
If same return true.
I have similar idea like #geofh, but it need not wrap all your arrays into another one as input.
function compare(...arrays) {
return arrays.every(arr => arr.length === arrays[0].length);
}
With it, you could invoke compare([1, 2, 3], [5, 6, 7], [1, 9], ...)
OK, I owe you an answer since I erroneously marked it as duplicate. To generalize, you need a sameLength function that takes an array of arrays, perhaps. That could look like:
function sameLength(arrays) {
return arrays.slice(1).every(arr => arr.length === arrays[0].length)
}
so sameLength([arr1, arr2, arr3]) would return false in your case.

JavaScript - Compare two array and insert if not exists [closed]

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I have two arrays. For example:
var array1 = ["Q3","Q4","Q5","Q6","Q7","Q8"];
var array2 = ["Q5","Q6","Q7"];
The output of second array should be,
[0,0,"Q5","Q6","Q7",0];
I want to compare the first array with the second and fill the missing values with Zero 0.
array1 is the primary array and, for now, array2 will have this 3 values initially.
Given the example arrays a simple map -> includes would work:
var array1 = ["Q3","Q4","Q5","Q6","Q7","Q8"];
var array2 = ["Q5","Q6","Q7"];
console.log(array1.map(i => array2.includes(i) ? i : 0))

How to return array without square brackets or commas [closed]

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I have an array and I want to return it with the commas and the square brackets removed from the returned value so that I can more easily analyze it and use its contents to make a sentence for a user to read better rather than a confusing script for those who don’t know JavaScript. Is there an efficient way to do this?
var a = [5, 6, 7, 3, 1];
console.log(a);
//-> [5, 6, 7, 3, 1] | I want 56731
Use .join(). This returns a string which is the array's elements joined together with nothing.
var a = [5, 6, 7, 3, 1];
console.log(a.join(""));

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