How to render a string from a json context?

templateRender.js.md

// Either extend the String prototype or use it as independent func
String.prototype.interpolate = function(props) {
    return this.replace(/\{(\w+)\}/g, function(match, expr) {
        return (props || window)[expr];
    });
};


var obj1 = {"template": "Hi, {var1} is {var2}",
            "context": "{\"var1\": null, \"var2\": null}"};

// raw template value 
obj1.template
>> 'Hi, {var1} is {var2}'


// find the context 
var context = JSON.parse(obj1.context)
context
>> {var1: null, var2: null}

context.var1 = "bhanu"
>> 'bhanu'
context.var2 = "a developer"
>> 'abc123ABC'

>>obj1.template.interpolate(context)
'Hi, bhanu is a developer'

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