JavaScript JavaScript empty string slice javascript empty string falsey,javascript empty string truthy,javascript empty

I was using a for loop to conditionally iterate over HTML input and concatenate a pipe separated string. Because I didn't want an ending pipe character I used foo.slice(0, -1).

It occurred to me that it is possible that there is no input and so foo would be an empty string. I was not sure if foo.slice(0, -1) is cross browser safe in this case so I tried this:

var foo = "";
foo = foo.slice(0, -1);

Firefox's "Browser Console" did not complain surprisingly so I assume some kind of bounds checking is going on but wanted to ask to be sure. I know that a test like if (foo) … would be enough to check for an empty string but was unsure if it is necessary. I couldn't seem to find anything about this in references: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/slice

Answer:1

I'm writing some simple code to change the visibility of an image when a button is clicked, but my document.getElementById().value is coming up as undefined. (I've tried replacing .value with .display ...

I'm writing some simple code to change the visibility of an image when a button is clicked, but my document.getElementById().value is coming up as undefined. (I've tried replacing .value with .display ...

  1. getelementbyid not returning value

I want to move items between two Listboxes in ASP.Net using JQuery/Javascript and below is my code which is working perfectly. function AddItems() { var totalItemsSelected = 0; var ...

I want to move items between two Listboxes in ASP.Net using JQuery/Javascript and below is my code which is working perfectly. function AddItems() { var totalItemsSelected = 0; var ...

  1. move items between sharepoint lists
  2. move items between vaults 1password
  3. move items between characters destiny 2
  4. move items between two select lists
  5. move items between calendars in outlook
  6. move items between layers indesign
  7. move items between two listbox c#
  8. move items between settlements fallout 4
  9. move items between listboxes c#
  10. move items between listboxes vba
  11. move items between listboxes
  12. move items between two listboxes javascript
  13. move items between folders in sharepoint
  14. move items between keychains
  15. move items between two select lists bootstrap
  16. move items between lists angular
  17. move items between list view javafx
  18. zotero move items between collections
  19. rimworld move items between stockpiles
  20. bdo move items between characters

I'm trying to do a js app that would basically move some balls on a canvas element. I set the context.fillStyle = "rgba(12, 34, 56, 0.2)"; the problem is that the balls become opaque from transparent ...

I'm trying to do a js app that would basically move some balls on a canvas element. I set the context.fillStyle = "rgba(12, 34, 56, 0.2)"; the problem is that the balls become opaque from transparent ...

I am attempting to write a pair of shaders for WebGL which will allow me to render a color cube. However, when I attempt to open the file, I receive the error "unable to initialize the shader program"...

I am attempting to write a pair of shaders for WebGL which will allow me to render a color cube. However, when I attempt to open the file, I receive the error "unable to initialize the shader program"...