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Additionally, the let function enables list unpacking by assigning all unassigned values to the last named variable. The first two arguments, var and list, are expanded before anything else is done; note that the last argument, text, is not expanded at the same time. Next, each word of the expanded value of list is bound to each of the variable names, var, in turn, with the final variable name being bound to the remainder of the expanded list. In other words, the first word of list is bound to the first variable var, the second word to the second variable var, and so on. If there are more variable names in var than there are words in list, the remaining var variable names are set to the empty string. If there are fewer vars than words in list then the last var is set to all remaining words in list. The variables in var are assigned as simply-expanded variables during the execution of let.
If there are no further arguments, then the function expands to empty if the left-hand side and right-hand side do not compare equal, or to their numerical value if they do compare equal. Else if the left-hand side is strictly less than the right-hand side, the intcmp function evaluates to the expansion of the third argument, lt-part. If both sides compare equal, then the intcmp function evaluates to the expansion of the fourth argument, eq-part. If the left-hand side is strictly greater than the right-hand side, then the intcmp function evaluates to the expansion of the fifth argument, gt-part. If gt-part is missing, it defaults to eq-part. If eq-part is missing, it defaults to the empty string. The let function provides a means to limit the scope of a variable. The assignment of the named variables in a let expression is in effect only within the text provided by the let expression, and this assignment doesn’t impact that named variable in any outer scope.
The syntax of the conditional-directive is the same whether the conditional is simple or complex; after an else or not. There are four different directives that test different conditions. Expand all variable references in arg1 and arg2 and compare them. If they are identical, the text-if-true is effective; otherwise, the text-if-false, if any, is effective. Often you want to test if a variable has a non-empty value. When the value results from complex expansions of variables and functions, expansions you would consider empty may actually contain whitespace characters and thus are not seen as empty. However, you can use the strip function (see Functions for String Substitution and Analysis) to avoid interpreting whitespace as a non-empty value. Expand all variable references in arg1 and arg2 and compare them. If they are different, the text-if-true is effective; otherwise, the text-if-false, if any, is effective. The ifdef form takes the name of a variable as its argument, not a reference to a variable.
You can get the errors in the object returned by mjml2html. It is the same object returned by getErrors on strict mode. One of the great advantages of MJML is that it’s component-based. Components abstract complex patterns and can easily be reused. In addition to the standard library of components, it is also possible to create your own components! We have published a step-by-step guide here that explains how to create a custom components with MJML 4. It will introduce to you the boilerplate repo hosted on Github, which provides a fast way of getting started developing your own components. MJML can not only be used as a markup, but also as a JSON object, which can be very useful for programmatic manipulation or with the MJML API. Exactly like using MJML as a markup, the JSON definition can be passed as an object to the mjml2html function. Visual Studio Code is a free code editor made by Microsoft.
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