In python & other programming languages there's a way to substitute a variable's value in between a string easily, like this,
name="python"
a="My name is %s"%name
print a
>>>My name is python
How do I achieve this in java-script? The plain old string concatenation is very complex for a large string.
It's 2017, we have template literals.
var name = "javascript";
console.log(`My name is ${name}`);
// My name is javascript
It uses back-tick not single quote.
You may find this question and answers also useful. JavaScript equivalent to printf/string.format
There's no native way to do that. In javascript, you do:
var name = 'javascript';
var a = 'My name is ' + name;
console.log(a);
>>>My name is javascript
Otherwise, if you really would like to use a string formatter, you could use a library. For example, https://github.com/alexei/sprintf.js
With sprintf library:
var name = 'javascript';
sprintf('My name is %s', name);
>>>My name is javascript
Another way is using CoffeeScript. They have sugar like in ruby
name = "javascript"
a = "My name is #{name}"
console.log a
# >>> My name is javascript
This is not possible in javascript, so the only way to achieve this is concatenation. Also another way could be replacing particular values with regexp.
Using Node, this should work.
[terryp@boxcar] ~ :: node
> var str = 'string substitute!';
> console.log('This is a %s', str);
This is a string substitute!
>
