How to work out values in javascript

by

The string is treated as if it were an array of characters and the indexOf looks for the first occurrence of the provided string. If it does not find it then it returns -1 to indicate not found.

var str="Hello World"
s = str.indexOf("o");
console.log(s); //4th position - indexes are begin at zero - so its fifth in the array.
s = str.indexOf("w");
console.log(s); //-1 - not found
s = str.indexOf("r");
console.log(s); //8
s = str.lastIndexOf("l");
console.log(s); //9

More Related Contents:

  1. How can you add tooltip to an anchor
  2. How do I check if a variable is an array in JavaScript?
  3. Scroll to bottom of div?
  4. How can I get file extensions with JavaScript?
  5. How to remove all line breaks from a string
  6. JavaScript: Passing parameters to a callback function
  7. What are the precise semantics of block-level functions in ES6?
  8. Better way to sum a property value in an array
  9. WebRTC firefox constraints
  10. javascript extract certain properties from all objects in array
  11. Angular 4.3.3 HttpClient : How get value from the header of a response?
  12. Is a JavaScript array index a string or an integer?
  13. ‘Hoisted’ JavaScript Variables
  14. Why does Javascript getYear() return 108?
  15. Webhoster inserts a javascript which brokes my code how to remove it?
  16. How to handle lack of JavaScript Object.bind() method in IE 8
  17. Moment JS start and end of given month
  18. Localize Strings in Javascript
  19. Limiting number of displayed results when using ngRepeat
  20. How to control Sass Variable with javascript
  21. Multiple read more / read less sections are not working on a page
  22. In Javascript, how do I determine if my current browser is Firefox on a computer vs everything else?
  23. Drawing lines on html page
  24. Measuring text width/height without rendering
  25. Sending mail from HTML page with image in the body
  26. React-Redux: Should all component states be kept in Redux Store
  27. How can I view array structure in JavaScript with alert()?
  28. Img src path with header params to pass
  29. Bootstrap linking to a tab with an url
  30. Assign only if condition is true in ternary operator in JavaScript

Leave a Comment