Template array

Returns an array or string. An array has the specified number of elements from the start of the array. A string has the specified number of characters from the start of the string. The following example takes the specified number of elements from the array, and characters from a string.

Returns a single array or object with all elements from the parameters. Duplicate values or keys are only included once. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Please rate your experience Yes No. Any additional feedback?

Submit and view feedback for This product This page. View all page feedback. In this article. Here is an example nested hierarchy. Then, in fileA. If fileC. When fileB. You can keep your templates in other repositories. For example, suppose you have a core pipeline that you want all of your app pipelines to use. You can put the template in a core repo and then refer to it from each of your app repos:.

Now you can reuse this template in multiple pipelines. Use the resources specification to provide the location of the core repo. When you refer to the core repo, use and the name you gave it in resources. Repositories are resolved only once, when the pipeline starts up. After that, the same resource is used for the duration of the pipeline.

Only the template files are used. Once the templates are fully expanded, the final pipeline runs as if it were defined entirely in the source repo. This means that you can't use scripts from the template repo in your pipeline. If you want to use a particular, fixed version of the template, be sure to pin to a ref. If you want to pin a specific commit, first create a tag pointing to that commit, then pin to that tag. You may also use self to refer to the repository where the main pipeline was found.

This is convenient for use in extends templates if you want to refer back to contents in the extending pipeline's repository. For example:. Use template expressions to specify how values are dynamically resolved during pipeline initialization. Template expressions can expand template parameters, and also variables. You can use parameters to influence how a template is expanded. The parameters object works like the variables object in an expression.

Only predefined variables can be used in template expressions. Expressions are only expanded for stages , jobs , steps , and containers inside resources. You cannot, for example, use an expression inside trigger or a resource like repositories. Within a template expression, you have access to the parameters context that contains the values of parameters passed in.

Additionally, you have access to the variables context that contains all the variables specified in the YAML file plus many of the predefined variables noted on each variable in that topic. Importantly, it doesn't have runtime variables such as those stored on the pipeline or given when you start a run. Template expansion happens very early in the run , so those variables aren't available.

You can add a validation step at the beginning of your template to check for the parameters you require. Here's an example that checks for the solution parameter using Bash which enables it to work on any platform :. You can use general functions in your templates. You can also use a few template expression functions. You can use template expressions to alter the structure of a YAML pipeline. For instance, to insert into a sequence:.

If you want to conditionally insert into a sequence or a mapping in a template, use insertions and expression evaluation. You can also use if statements outside of templates as long as you use template syntax. You can also use conditional insertion for variables. In this example, start always prints and this is a test only prints when the foo variable equals test. The each directive allows iterative insertion based on a YAML sequence array or mapping key-value pairs.

Alternatively, it can return something completely different, as described in one of the following examples. The special raw property, available on the first argument to the tag function, allows you to access the raw strings as they were entered, without processing escape sequences.

In addition, the String. This means that a tagged template like the following is problematic, because, per ECMAScript grammar, a parser looks for valid Unicode escape sequences, but finds malformed syntax:. Tagged templates should allow the embedding of languages for example DSLs , or LaTeX , where other escapes sequences are common. Note that the escape sequence restriction is only dropped from tagged templates—not from untagged template literals:. Untagged template literals result in strings, which makes them useful for string interpolation and multiline strings, since unescaped newlines are allowed.

Tagged template literals call a function the tag function with an array of any text segments from the literal followed by arguments with the values of any substitutions, which is useful for DSLs. Any newline characters inserted in the source are part of the template literal.

Using normal strings, you would have to use the following syntax in order to get multi-line strings: console.