A comprehensive collection of JavaScript utility functions for modern development. Written in TypeScript with full type safety and extensive JSDoc documentation.
yarn add @mj-studio/js-util
npm install @mj-studio/js-util| Category | Function | Description |
|---|---|---|
| String | camelCase(str) |
Converts snake_case or kebab-case to camelCase |
snakeCase(str) |
Converts strings to snake_case format | |
capitalize(str) |
Capitalizes the first character | |
| Object | camelCaseObject(obj) |
Recursively converts object keys to camelCase |
snakeCaseObject(obj) |
Recursively converts object keys to snake_case | |
reverseObjectKeyValues(obj) |
Swaps keys and values in object | |
replaceJsonKeysRecursively(obj, options) |
Replace object keys recursively | |
replaceJsonValuesRecursively(obj, options) |
Replace object values recursively | |
| Array | groupByArray(arr, getKey) |
Groups array elements into subarrays |
groupByObject(arr, getKey) |
Groups array elements into object | |
doBatch(arr, work, batchCount) |
Processes arrays in batches | |
unique(arr) |
Removes duplicate values | |
generateArray(size) |
Creates array [0, 1, 2, ..., size-1] | |
randomItem(arr) |
Returns random element | |
lastOf(arr) |
Returns last element | |
toggled(arr, element) |
Toggles element in array | |
| Promise | withTimeout(ms, promise) |
Adds timeout to promises |
withMinimumResolveTime(ms, promise) |
Ensures minimum resolve time | |
| Type Check | is.string(value) |
String type check |
is.number(value) |
Number type check (excludes NaN) | |
is.boolean(value) |
Boolean type check | |
is.array(value) |
Array type check | |
is.function(value) |
Function type check | |
is.object(value) |
Object type check (excludes null) | |
is.plainObject(value) |
Plain object type check | |
is.null(value) |
Null check | |
is.undefined(value) |
Undefined check | |
is.nullOrUndefined(value) |
Null or undefined check | |
is.falsy(value) |
Falsy values check | |
is.truthy(value) |
Truthy values check | |
is.notEmptyString(value) |
Non-empty string check | |
is.emptyString(value) |
Empty string check | |
is.numberString(value) |
Numeric string check | |
is.integerString(value) |
Integer string check | |
is.notEmptyArray(value) |
Non-empty array check | |
is.emptyArray(value) |
Empty array check | |
is.promise(value) |
Promise check | |
| Filter | filterJsonKeys(json, keys) |
Filter JSON object by keys |
filterNonNullish(arr) |
Remove null/undefined from array | |
filterNonNullishKeys(obj, options) |
Remove null/undefined from object | |
removeValueByKeyInObject(obj, key) |
Remove specific keys from object | |
| Number | numberWithComma(num) |
Format with thousand separators |
padZero(num, len) |
Pad with leading zeros | |
toFixed(num, digits, default) |
Safe toFixed with undefined handling | |
toFixedIfNeed(num, digits) |
toFixed that removes trailing zeros | |
toSiUnitString(num) |
Convert to SI units (1.5K, 1.5M) | |
clamp(value, min, max) |
Clamps value between min and max | |
| Time | parseSecond(seconds) |
Parse seconds into time components |
formatSec(seconds, format) |
Format seconds with various formats | |
createTimer() |
Timer management | |
setIntervalWithTimeout(callback, ms) |
Clearable intervals | |
| Math | interpolate(value, inMin, inMax, outMin, outMax) |
Linear interpolation |
interpolateColor(ratio, startColor, endColor) |
Color interpolation | |
| Misc | formatJson(data) |
Pretty-print JSON with error handling |
lastMatchIndex(str, match) |
Find last occurrence index |
All functions include comprehensive TypeScript type definitions and JSDoc documentation for excellent IDE support.
See CONTRIBUTING.md for contribution guidelines.
MIT © MJ Studio