This question already has answers here:
ES6 template literals vs. concatenated strings
(4 answers)
Closed 1 year ago.
I'm start coding.
While I was watching a lecture, I saw code like this.
var coworkers = ['go', 'hello', 'hi', 'doit'];
<script type="text/javascript">
var i = 0;
while(i < coworkers.length){
document.write('<li>'+coworkers[i]+'</li>');
i = i + 1;
}
But But when I searched, Said to use ${variable} in JavaScript. and It didn't work.
How are +variable+ and ${variable} different in javascript? Thanks :)
Those placeholders, like ${variable}, can only be used in template literals, which are always enclosed in backticks(the key right below you escape key).
If it still doesn’t work, maybe you’re using an older browser?
Related
This question already has answers here:
Javascript counting the frequency letters of a string
(4 answers)
Closed 7 months ago.
I'm new at JS. When I work on frequency maps in C++, I can do something like:
map<char,int> newMap = {{'a',1}, {'b',2}, {'c',3}, {'d',4}};
newMap['a']++;
And this increases the value corresponding to 'a' to 2 from 1
But I can't do:
let m = new Map()
m.set('a',1)
m.get('a')++
Can anybody tell me a workaround for this?
Thanks
If you're using a Map, there is no way to change primitive values in a Map other than calling map.set each time. But if you were using a plain object instead, you could use shorthand syntax very similar to what you're familiar with in C++.
const m = { a: 1 };
m.a++;
console.log(m);
This question already has answers here:
How to get value at a specific index of array In JavaScript?
(8 answers)
Closed 2 years ago.
so I am currently learning javascript on Codecademy. And a weird kind of thing got introduced that I don't quite get.
if you look at the code. you see at the end in console that after logging animals it is a [i] like why is that there? I get that is has something to do with the for loop. But I don't quite understand like why or what that it does. I don't know if question is clear enough but if you just try to explain why it is there and what it does there. that would be greatly appreciated:)
const animals = ['Grizzly Bear', 'Sloth', 'Sea Lion'];
for (let i = 0; i < animals.length; i++){
console.log(animals[i]);
}
the bracket notation is used to specify the index of the array you are looping through. You can always read more about javascript arrays on w3schools
This question already has answers here:
Unescape apostrophe (') in JavaScript?
(2 answers)
Closed 8 years ago.
I have a simple string which is
Company's
Now I have some javascript which is ran when a form is submitted
var jsCompanyName = '#Model.Name';
var unescapedCompanyName = unescape(jsCompanyName);
$('.selector-input').val(unescapedCompanyName);
$('.selector-input-id').val('#Model.Id');
Going thought with a debugger, my var unescapedCompanyName is still "Company's" even after the unescape function, does anyone have any idea on why this isn't removing ' and replacing it with a '
The unescape() function has nothing to do with HTML syntax. It's for handling escapes in URL syntax, which is a completely different thing. (It's also deprecated even for its intended purpose.)
There's no built-in function to deal with HTML escapes. However, code running in a web browser can do something like this:
function html_unescape(s) {
var div = document.createElement("div");
div.innerHTML = s;
return div.textContent || div.innerText; // IE is different
}
You can do this easily with JQUERY if you really need to:
function htmlDecode(value) {
return $('<div/>').html(value).text();
}
var str = 'Company's';
console.log(htmlDecode(str)); // Company's
JSFIDDLE.
This question already has answers here:
Determine whether an array contains a value [duplicate]
(18 answers)
Closed 9 years ago.
Is there a built-in function in javascript to do this or this is only the option to go? Please look at the code below:
var arr=[1,3,4,'+','-', or whatever]
function value_check(user_click){
var operators=['+','-','/','*','.']
for (var i=0;i<operators.length;i++){
if (arr[arr.length-1]==operators[i]){var value1='operator found';}
if (user_click==operators[i]){
var value2= value1;alert("consecutive operators"); break;
}
}
}
I think this code achieves what I intend to do but is there a simple and shorter way of doing this. In words, I want to achieve something like this:
if (arr[arr.length-1] && user_click BOTH ARE IN operators array)
alert("consecutive operators)
Yes, there are some options:
JavaScript indexOf()
jQuery.inArray()
arrayName.indexOf() is what you are looking for.
This question already has answers here:
Replace method doesn't work
(4 answers)
Closed 8 years ago.
I followed some documentation to use the JavaScript replace function and it's not changing anything. No errors are thrown. Any idea what I'm doing wrong? The variable is retrieved from XML - maybe it needs to be cast as a string or something?
for (var i = 0, iln = projects.length; i < iln; i++){
var thumb = projects[i].get('thumb');
thumb.replace("200.jpg", "640.jpg");
console.log(thumb) //200.jpg not replaced
}
The full thumb value should look like this:
http://b.vimeocdn.com/ts/160/895/160895498_200.jpg
Is there a better way to find and replace things?
Assign the value back into thumb.
thumb = thumb.replace("200.jpg", "640.jpg");
Try:
thumb = thumb.replace("200.jpg", "640.jpg");