Dependency injection in 1.x

Last reviewed May 28, 2026 Content v20260528

Track mode

client_angularjs

Means

In-browser AngularJS 1.x

Reading

~1 min

Level

intermediate

This lesson

This lesson teaches Dependency injection in 1.x: the concepts, APIs, and habits you need before advancing in AngularJS.

provide/inject shares data down the tree without prop drilling—pair with caution and clear keys.

You will apply Dependency injection in 1.x in contexts like: Long-lived intranet apps, government portals, and codebases not yet moved to Angular, React, or Vue.

Write JavaScript for AngularJS 1.8, click Run—register modules/controllers, then mountApp(moduleName, templateHtml) in #ng-app; printOutput feeds the terminal.

When you can explain the previous lesson's ideas without copying starter code.

AngularJS DI resolves $http, $route, and custom services by name in constructor arrays.

Important interview questions and answers

Q: Why does this matter?
A: AngularJS DI resolves $http, $route, and custom services by name in constructor arrays.

Self-check

Summarize Dependency injection in 1.x in one sentence.
What would you try next in the playground?

Tip: Minified builds need $inject arrays or ngAnnotate—never rely on parameter names alone.

Interview prep

Why array notation in DI?: Survives minification—parameter names are not reliable after build.

Playground

Runs in your browser in a sandboxed frame. Backend runners appear when this track’s profile allows them.

Discussion

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Starter discussion topics

$inject array why?
Minification safe?

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