In JavaScript, you can construct strings using variables by using string interpolation. This can be done using template literals, which are strings that are surrounded by backticks (`).
Here is an example of how you can use template literals to construct a string with a variable:
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let name = 'John';
console.log(`Hello, ${name}!`);
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The output of this code would be: “Hello, John!”
You can also use variables in string concatenation, like this:
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let name = 'John';
console.log('Hello, ' + name + '!');
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The output of this code would be the same: “Hello, John!”
Template literals offer a more concise and readable way to construct strings with variables, and they also allow you to include expressions inside the string. For example:
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let count = 10;
console.log(`The value of count is ${count * 2}`);
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The output of this code would be: “The value of count is 20”
You can also use multi-line strings with template literals by using line breaks and indentation. For example:
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let message = `Hello, World!`; console.log(message);
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The output of this code would be:
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Hello, World!
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Here are a few more things you might want to know about constructing strings with variables in JavaScript:
- You can use any type of variable inside a template literal, not just strings. For example, you can use numbers, booleans, and objects.
- You can use template literals inside regular strings, but you need to escape the backticks with a backslash (). For example:
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let name = 'John';
console.log('Hello, \\${name}!');
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The output of this code would be: “Hello, ${name}!”
- You can use template literals in any context where you can use a string, including as the value of an object key or as an argument to a function.
- If you need to include a backtick inside a template literal, you can escape it with a backslash (). For example:
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console.log(`The backtick character is \` `);
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The output of this code would be: “The backtick character is ` ”
