[{"data":1,"prerenderedAt":4040},["ShallowReactive",2],{"indicators:core-concepts/core-variables":3},{"slug":4,"filePath":5,"frontmatter":6,"rawMarkdown":11,"tree":12},"core-concepts/core-variables","core-concepts/core-variables.md",{"title":7,"description":8,"order":9,"section":10},"Variables: locals, module state, and history","Variable declaration and bar-state behavior in an Indicator: what a local in state() is, what a module-level variable is, and how a value with history is kept.…",13,"core-concepts","---\ntitle: \"Variables: locals, module state, and history\"\ndescription: \"Variable declaration and bar-state behavior in an Indicator: what a local in state() is, what a module-level variable is, and how a value with history is kept.…\"\norder: 13\nsection: \"core-concepts\"\n---\n\n\u003C!-- source: docs/indicators/core-concepts/core-variables.md; generated by packages/cli/scripts/gen-indicator-docs.ts, do not edit -->\n\n# Variables: locals, module state, and history\n\nVariable declaration and bar-state behavior in an Indicator: what a local in\n`state()` is, what a module-level variable is, and how a value with history\nis kept. kScript (legacy) had three keywords for three lifetimes, `var`,\n`persist`, and `timeseries`; an Indicator has ordinary TypeScript scoping\nplus the four functions, and `reset()` to put everything back.\n\n## Declaration roles\n\n| kScript | Role | Indicator |\n| --- | --- | --- |\n| `var x = ...` | this bar only | a `const` or `let` inside `state()` or `finalize()` |\n| `persist n = 0` (or `static`) | carried across bars | a module-level `let`, initialized once, restored by `reset()` |\n| `timeseries s = ...`, read with `s[1]` | a value with history | a module-level \"previous\" variable, a TA class, or a ring buffer |\n\nA **local** is born when `state()` is called for a bar and gone when it\nreturns. It is right for a scalar you compute and use immediately: this\nbar's typical price, a ratio, a comparison.\n\nA **module-level `let`** lives outside the four functions and keeps its\nvalue from one call to the next. A counter incremented on each bar keeps\nits running total for the whole run; an accumulator like a cumulative delta\nis one of these; so is any TA object, since its window is state too. Every\nmodule-level variable is `reset()`'s responsibility.\n\nA **value with history** is what `timeseries` gave you for free and what\nan Indicator makes you keep on purpose. For `[1]`, store the value in a\nmodule-level variable when you see it and read it on the next bar. For\n`[n]` over a window, a `StaticArray\u003Cf64>` used as a ring buffer. For a\nwindowed statistic, a class from `./sdk/ta` holds the window for you.\n\n## Bar-state globals\n\nkScript exposed `barIndex`, `isFirst`, `isConfirmed`, and `isLastBar` as\nglobals. None of them exists in an Indicator; each has a plain replacement\nor no need:\n\n| kScript | Indicator |\n| --- | --- |\n| `barIndex` | a module-level counter you increment in `state()` |\n| `isFirst` | that counter at `0` (or a `first` flag `init()` sets and `state()` clears) |\n| `isConfirmed` | no flag: on the chart the newest bar is the forming one and replays on every tick through `reset()`; on your machine `om metric series` returns it as its newest row, and closed-bar consumers cut it before the module sees it |\n| `isLastBar` | nothing to write: renderers and drawings evaluate the newest ready row on their own, and a metric is read at its newest value |\n\nThe one-time initialization `isFirst` served is `init()` itself: it runs\nonce before the first bar and reads the params. Logic that must run on the\nfirst bar of data (seeding a level from the first open) is the counter test.\n\n## Tuple destructuring\n\nA multi-output builtin bound with `[macdLine, signalLine, histLine] =\nmacd(...)` becomes a class whose fields you read by name after `update()`\n(`named-streams.md`); there are no tuples.\n\n## History example\n\nThe kScript \"timeseries source moves\" example, ported: the close, the\none-bar change (a remembered previous close), and a moving average whose\nclass holds the window. Nothing here is indexed; everything is kept.\n\n```typescript\nimport { input, line, lower, ohlcv, output, overlay, param } from \"./sdk/declare\";\nimport { in_close } from \"./gen/inputs\";\nimport { emitRow, out_change, out_moving_average } from \"./gen/outputs\";\nimport { p_period } from \"./gen/params\";\nimport { Sma } from \"./sdk/ta\";\n\nparam(\"period\", 20, { min: 1, max: 200, description: \"SMA length\" });\ninput(\"close\", ohlcv.close);\noutput(\"moving_average\", line, overlay, { color: \"#dc2626\", width: 2, description: \"SMA of the close (the class keeps the window)\" });\noutput(\"change\", line, lower, { color: \"#2563eb\", width: 2, description: \"Close minus the previous close (one remembered value)\" });\n\nlet sma = new Sma(20);\nlet prevClose: f64 = NaN; // stands in for closeSeries[1]\nlet change: f64 = NaN;\nlet average: f64 = NaN;\n\nexport function init(): void {\n sma = new Sma(i32(p_period()));\n}\n\nexport function state(): i32 {\n const close = in_close(); // a local: this bar's value, gone after the call\n change = isNaN(prevClose) ? NaN : close - prevClose;\n prevClose = close; // remember it for the next bar\n average = sma.update(close);\n return isNaN(change) ? 0 : 1;\n}\n\nexport function finalize(): void {\n out_change(change);\n out_moving_average(average);\n emitRow();\n}\n\nexport function reset(): void {\n sma.reset();\n prevClose = NaN;\n change = NaN;\n average = NaN;\n}\n```\n\nOn the first bar there is no previous close, so `change` is `NaN` and the\nrow abstains; from the second bar on the change draws, and the average\njoins it once its window is full (writing `NaN` until then is a gap on that\none line, not an abstained row).\n\n## Persist example\n\nThe kScript \"persist counter\" example, ported: a bar counter that keeps its\nrunning total, plus the `barIndex` and `isFirst` replacements in the same\nfile.\n\n```typescript\nimport { input, line, lower, ohlcv, output } from \"./sdk/declare\";\nimport { in_close, in_open } from \"./gen/inputs\";\nimport { emitRow, out_bar_index, out_carried_score, out_first_open } from \"./gen/outputs\";\n\ninput(\"close\", ohlcv.close);\ninput(\"open\", ohlcv.open);\noutput(\"carried_score\", line, lower, { color: \"#16a34a\", width: 2, description: \"Bars seen plus this bar's body: a value carried across bars\" });\noutput(\"bar_index\", line, lower, { color: \"#94a3b8\", description: \"0 on the oldest bar, counting up\" });\noutput(\"first_open\", line, lower, { color: \"#f59e0b\", description: \"The open of the first bar of loaded history, held\" });\n\nlet barsSeen: f64 = 0.0; // persist barsSeen = 0\nlet barIndex: i32 = 0; // the barIndex global, kept by hand\nlet firstOpen: f64 = NaN; // seeded once, on the first bar\nlet score: f64 = NaN;\n\nexport function init(): void {}\n\nexport function state(): i32 {\n const open = in_open();\n const close = in_close();\n if (barIndex == 0) firstOpen = open; // isFirst\n barsSeen += 1.0;\n score = barsSeen + (close - open);\n barIndex += 1;\n return 1;\n}\n\nexport function finalize(): void {\n out_carried_score(score);\n out_bar_index(f64(barIndex - 1));\n out_first_open(firstOpen);\n emitRow();\n}\n\nexport function reset(): void {\n barsSeen = 0.0;\n barIndex = 0;\n firstOpen = NaN;\n score = NaN;\n}\n```\n\n`barsSeen` is the persisted counter; `barIndex` is the same idea kept as\nan `i32` and written to an output as `f64(barIndex - 1)` (the increment\nhappens before `finalize()` runs). The counter says `0` on the oldest\nloaded bar, not on the first bar the market ever traded: history depth is\nwhatever the host loaded.\n\n## Boundaries\n\n**Indexing a number is refused.** `const previous = closeNow[1];` on an\n`f64` fails to compile with `Index signature is missing in type 'f64'`.\nThere is nothing to index: promote the value to a remembered variable or a\nring buffer.\n\n**A local does not survive the call.** A `let` declared inside `state()`\nstarts over on every bar. If you meant to carry it, move the declaration\nto module level.\n\n**`reset()` must restore every module-level variable.** The host snapshots\nthe module after the last closed bar and replays the forming bar into it on\nevery tick; a variable `reset()` forgets is a stale value the replay reads,\nand the forming bar draws wrong (`repainting.md`). Reassign every\nmodule-level `let` and call `.reset()` on every TA object; a class you wrote\ngets a `reset()` method of its own.\n\n**Allocate once.** A module-level `new StaticArray\u003Cf64>(n)` or `new Sma(n)`\nis built in `init()` or at module scope. Building one per bar is the one\npattern that makes a long history slow: the module has no garbage\ncollector, so memory only grows (`collections.md`).\n",{"type":13,"children":14,"data":4033,"position":4035},"root",[15,25,28,29,148,149,168,170,576,577,630,631,693,694,820,821,836,837,923,924,1266,1267,1315,1316,1332,1333,1401,1402,1418,1419,1434,1435,2456,2457,2526,2527,2543,2544,2594,2595,3515,3516,3631,3632,3648,3649,3733,3734,3799,3800,3931,3932],{"type":16,"value":17,"position":18},"comment"," source: docs/indicators/core-concepts/core-variables.md; generated by packages/cli/scripts/gen-indicator-docs.ts, do not edit ",{"start":19,"end":22},{"line":20,"column":20,"offset":21},1,0,{"line":20,"column":23,"offset":24},135,134,{"type":26,"value":27},"text","\n",{"type":26,"value":27},{"type":30,"tagName":31,"properties":32,"children":33,"position":145},"element","p",{},[34,43,57,65,78,85,97,104,117,125,138],{"type":26,"value":35,"position":36},"Variable declaration and bar-state 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