javascript / expert
Snippet
Deterministic State Machine Validation via Array Boundary Traps
Multi-step modal flows and checkout wizards require rigid sequence enforcement. Storing state history in encapsulated arrays while validating relative position transitions prevents dynamic path traversal bugs.
snippet.js
javascript
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class FiniteWorkflowPipeline {#stateHistory = [];pushStepTransition(nextStep, validationRules) {const currentStep = this.#stateHistory.at(-1) ?? null;if (validationRules.has(currentStep) && !validationRules.get(currentStep).includes(nextStep)) {return false;}this.#stateHistory.push(nextStep);return true;}}
vue
Breakdown
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class FiniteWorkflowPipeline {
Instantiates an object-oriented finite workflow control engine.
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#stateHistory = [];
Stores state transition steps sequentially within a private private array field.
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pushStepTransition(nextStep, validationRules) {
Validates and appends a new state step into the execution stack.
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const currentStep = this.#stateHistory.at(-1) ?? null;
Fetches the current active step using relative indexing array access.
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if (validationRules.has(currentStep) && !validationRules.get(currentStep).includes(nextStep)) {
Checks if the requested transition is explicitly allowed by boundary rules.
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return false;
Rejects forbidden workflow jumps by returning a falsy control flag.
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this.#stateHistory.push(nextStep);
Appends the verified target step to the sequence history array.
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return true;
Confirms successful transition step execution.