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2235 articles
JavaScript lastIndexOf: Get the Last Index in Strings and Arrays
JavaScript lastIndexOf for strings and arrays: find the last index of a value, use fromIndex, handle -1, compare indexOf vs lastIndexOf, and understand strict …
JavaScript infinite loop: forever loop syntax, bugs, and how to avoid them
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JavaScript dictionary: objects, Map, and dict patterns
JavaScript dictionary guide: plain objects vs Map for key-value data (js dict / dict in javascript). CRUD, iteration, Object.create(null), non-string keys, and …
Linked list in JavaScript & JS: ListNode, build, traverse (linked list javascript)
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JavaScript findIndex: array findIndex and objects by property
findIndex javascript and js findIndex: predicate scan with Array.prototype.findIndex, return index or -1, optional thisArg, javascript find index of object in …
JavaScript get width of element: offsetWidth, clientWidth, getComputedStyle, DOMRect
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JavaScript equality: equals, == vs ===, and the equal sign
JavaScript equality: loose == vs strict ===, type coercion, null and undefined, NaN and Object.is. Short notes after snippets describe expected console output …
window.location.reload(true) deprecated: location.reload & forceGet (javascript location reload)
javascript:location.reload(true), javascript location reload true, location.reload(true), window location reload, location reload, window.location.reload(true) …
JavaScript get element & find element: getElementById, querySelector, collections
js get element, javascript find element: getElementById, querySelector, querySelectorAll, getElementsByClassName, getElementsByTagName. Snippets use …
JavaScript if not: logical NOT (!), if (!condition), and not in checks
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JavaScript double exclamation mark (!!): boolean coercion
JavaScript double exclamation (!!) vs Boolean(): same boolean coercion to true/false, truthy and falsy lists, TypeScript idiom, and why [] is truthy. Runnable …
JavaScript error: IPython is not defined (Jupyter & matplotlib fix)
Fix missing IPython in the notebook browser context: secure URL, matplotlib backend (%matplotlib inline vs widget/ipympl), kernel restart, VS Code Jupyter …
Linux memory limits in containers (cgroups, Docker, Kubernetes)
Learn how Linux enforces memory limits inside containers using cgroups, how cgroup v1 and v2 differ, why tools disagree, and how Docker and Kubernetes map …
Pause and Resume Patterns for Kubernetes Operators
Design pause and resume for Kubernetes Operators: spec.paused vs annotations, what still runs when paused, skipping child updates vs deletes, finalizers and …
From Commit to Cluster: End-to-End Operator Release Pipeline
Release a Kubernetes Operator from Git tag to cluster: build the manager image, pin digests, render Helm or Kustomize manifests, validate CRDs and OLM bundles, …