Is there a way to utilize a switch statement in JavaScript to determine the quantity of numerical elements within an array?

Question

Is there a way to utilize a switch statement in JavaScript to determine the quantity of numerical elements within an array?

I am attempting to use a switch statement in my function to count the number of elements (numbers only) in an array. However, I am uncertain about how exactly the code should be structured. This is what I have managed to come up with thus far:

<script language="JavaScript">
//array containing numbers
var numbers = [1,"o",2,3,"a",0];
//implementing a switch statement

switch (numbers) {
    //I am unsure of the syntax to use here....

    break;
}
  //output result of the count
alert(count)
</SCRIPT>

javascript arrays switch-statement

Answer 1

Answer №1

using a switch statement

if you insist:

let counter = 0;
for( let index=0 ; index<numsArray.length ; ++index )
    switch( typeof(numsArray[index]) ) {
        case "number": ++counter; break;
    }

counter now holds the value of 4.

Note: NaN, Number.NEGATIVE_INFINITY, and Number.POSITIVE_INFINITY are also considered as "number"s, so if you need to exclude them from the count, use this modification:

let counter = 0;
for( let index=0 ; index<numsArray.length ; ++index )
    switch( typeof numsArray[index] ) {
        case "number":
            if( !isNaN(numsArray[index]) && isFinite(numsArray[index]) )
                ++counter;
    }

Answer 2

using a switch statement

if you insist:

let counter = 0;
for( let index=0 ; index<numsArray.length ; ++index )
    switch( typeof(numsArray[index]) ) {
        case "number": ++counter; break;
    }

counter now holds the value of 4.

Note: NaN, Number.NEGATIVE_INFINITY, and Number.POSITIVE_INFINITY are also considered as "number"s, so if you need to exclude them from the count, use this modification:

let counter = 0;
for( let index=0 ; index<numsArray.length ; ++index )
    switch( typeof numsArray[index] ) {
        case "number":
            if( !isNaN(numsArray[index]) && isFinite(numsArray[index]) )
                ++counter;
    }

Answer 3

Answer №2

I find the existing answers to be quite lengthy and inefficient.

Here is my approach, utilizing the .reduce method:

var numbers = [1,"o",2,3,"a",0];

var count = numbers.reduce(function(accumulator,current){
    return accumulator + (typeof current === "number");
});

Another option involves incorporating a necessary switch:

var numbers = [1,"o",2,3,"a",0];

var count = numbers.reduce(function(accumulator,current){
    return accumulator + (typeof current === "number");
    switch(true){} // This switch statement is named Alfred, inspired by Batman's loyal butler.
});

Answer 4

I find the existing answers to be quite lengthy and inefficient.

Here is my approach, utilizing the .reduce method:

var numbers = [1,"o",2,3,"a",0];

var count = numbers.reduce(function(accumulator,current){
    return accumulator + (typeof current === "number");
});

Another option involves incorporating a necessary switch:

var numbers = [1,"o",2,3,"a",0];

var count = numbers.reduce(function(accumulator,current){
    return accumulator + (typeof current === "number");
    switch(true){} // This switch statement is named Alfred, inspired by Batman's loyal butler.
});

Answer 5

Answer №3

let array = [1, "b", 2, 3, "x", 0];
let count = 0;
for(let j = 0; j < array.length; j++){
    if(typeof array[j] === "number") count++;
}
console.log(count);

Answer 6

let array = [1, "b", 2, 3, "x", 0];
let count = 0;
for(let j = 0; j < array.length; j++){
    if(typeof array[j] === "number") count++;
}
console.log(count);

Answer 7

Answer №4

Update: Sure thing! Let's implement a switch statement!

var count = 0;
for(var i = number.length; i--;){
    switch(true){
        case typeof number[i] == 'number':
            count++;
    }
}
alert(count);

Answer 8

Update: Sure thing! Let's implement a switch statement!

var count = 0;
for(var i = number.length; i--;){
    switch(true){
        case typeof number[i] == 'number':
            count++;
    }
}
alert(count);

Is there a way to utilize a switch statement in JavaScript to determine the quantity of numerical elements within an array?

Answer №1

Answer №2

Answer №3

Answer №4

Similar questions

Error: Service Liferay encountered an unexpected identifier causing a syntax error

Unable to configure AngularJS inputs to have a blank default value

Implementing the same logic across multiple multidimensional arrays is paramount

incorporating numerous interconnected javascript files within a single html document

Highlighting with pretty JSON formatting

Is there a workaround for making Three.js OnDocumentMouseDown compatible with touch screens?

Deleting a row from a Material UI table: Step-by-step guide

What is the target of the `proto` attribute in a constructor function?

There was an uncaught error in AngularJS stating that the URL in the HTTP request configuration must be a string

In Swift 3, there is a strange occurrence where the UICollectionView seems to repeat the final cell multiple

Tips for preventing the need to convert dates to strings when receiving an object from a web API

The jQuery hover function is not functioning properly on page load in Firefox

Discovering the Nearest Element in an Array: A Step-by-Step Guide

Performing automatic submission of form data without needing to redirect or refresh the page using Javascript

How can I use a dropdown with checkbox to toggle the visibility of a specific div in React?

What is the best way to show "no results found" message in a jQuery search list?

Positioning of dropdown in Material UI select component

Setting up an array using a pointer followed by retrieving information from it

Determining the sum of each third element in a Java array

Optimizing PHP Class for Enhancing Array Performance

Is there a way to utilize a switch statement in JavaScript to determine the quantity of numerical elements within an array?

Answer №1

Answer №2

Answer №3

Answer №4

Similar questions

Error: Service Liferay encountered an unexpected identifier causing a syntax error

Unable to configure AngularJS inputs to have a blank default value

Implementing the same logic across multiple multidimensional arrays is paramount

incorporating numerous interconnected javascript files within a single html document

Highlighting with pretty JSON formatting

Is there a workaround for making Three.js OnDocumentMouseDown compatible with touch screens?

Deleting a row from a Material UI table: Step-by-step guide

What is the target of the `__proto__` attribute in a constructor function?

There was an uncaught error in AngularJS stating that the URL in the HTTP request configuration must be a string

In Swift 3, there is a strange occurrence where the UICollectionView seems to repeat the final cell multiple

Tips for preventing the need to convert dates to strings when receiving an object from a web API

The jQuery hover function is not functioning properly on page load in Firefox

Discovering the Nearest Element in an Array: A Step-by-Step Guide

Performing automatic submission of form data without needing to redirect or refresh the page using Javascript

How can I use a dropdown with checkbox to toggle the visibility of a specific div in React?

What is the best way to show "no results found" message in a jQuery search list?

Positioning of dropdown in Material UI select component

Setting up an array using a pointer followed by retrieving information from it

Determining the sum of each third element in a Java array

Optimizing PHP Class for Enhancing Array Performance

What is the target of the `proto` attribute in a constructor function?