Consider the following scenario:
var data = '{"message": "`${message}`"}';
var obj = JSON.parse(data);
var templateValue = obj.message; //`${message}`
var message = 'hello';
What is the best way to evaluate the template so it returns hello?
Consider the following scenario:
var data = '{"message": "`${message}`"}';
var obj = JSON.parse(data);
var templateValue = obj.message; //`${message}`
var message = 'hello';
What is the best way to evaluate the template so it returns hello?
When JSON.parse() returns the value of obj.greetings as a string, one can utilize eval() to execute the string as JavaScript code. Here is how it can be done:
var json = '{"greetings": "`${greetings}`"}';
var obj = JSON.parse(json);
var template = eval(obj.greetings); //`${greetings}`
var greetings = 'hello';
console.log(greetings) // Output: hello
However, it is important to note that eval() should be used cautiously as it may lead to executing user inputted strings.
Edit:
The previous code snippet using eval results in returning undefined.
This occurs because JavaScript Hoisting does not function for initialized variables.
Hence, it becomes necessary to move the initialization of var greetings = 'hello'; to the top.
Solution without using eval():
Utilize template strings to encapsulate the entire string.
var greetings = 'hello';
var json = `{"greetings": "${greetings}"}`;
var obj = JSON.parse(json);
var template = obj.greetings; //`${greetings}`
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