Javascript template string

Question

I need to create some substrings using the template string. I try to use this code but I have some problem about the auto filling of the template.

        Object.keys(optionsParams).forEach(function (key) {
            let template = '&${key}=${value}';
            let value = optionsParams[key];
            url += template;
        });

key and value variables are not found. What's the problem?

Answer 1

To use template strings you need to use backticks ` instead of single or double quotes. Try the following code instead

Object.keys(optionsParams).forEach(function (key) {
    let value = optionsParams[key];
    let template = `&${key}=${value}`
    url += template;
});