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Lodash FP missing functions
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| /** | |
| * Returns true if item is defined | |
| * @example | |
| * isDefined('something') => true | |
| */ | |
| export const isDefined = (item: any): boolean => !isNil(item) | |
| /** | |
| * Scales a value from a range to another range | |
| * @example | |
| * scale(1, [0, 1], [0, 100]) => 100 | |
| * scale(5, [0, 10], [2, 4]) => 3 | |
| */ | |
| export const scale = ( | |
| value: number, | |
| startRange: number[], | |
| endRange: number[], | |
| ): number => { | |
| const result = | |
| ((value - startRange[0]) * (endRange[1] - endRange[0])) / | |
| (startRange[1] - startRange[0]) + | |
| endRange[0] | |
| return result || 0 | |
| } | |
| /** | |
| * Rename a property in object | |
| * @example | |
| * rename('a', 'b', { a: 1 }) => { b: 1 } | |
| */ | |
| export const rename = (fromPath: string, toPath: string, object: Object): Object => | |
| set(toPath, object[fromPath], omit([fromPath], object)) | |
| /** | |
| * Exchange value in fromPath key with value in toPath key | |
| * @example | |
| * trade('a', 'b', { a: 1, b: 2, c: 3 }) => { a: 2, b: 1, c: 3 } | |
| */ | |
| export const trade = (fromPath: string, toPath: string, object: Object): Object => { | |
| const fromValue = get(fromPath, object) | |
| return flow([rename(toPath, fromPath), set(toPath, fromValue)])(object) | |
| } | |
| /** | |
| * Returns array with value pushed at index | |
| * @example | |
| * insertAt(1, 9, [1, 2, 3]) => [1, 9, 2, 3] | |
| */ | |
| export const insertAt = (index: number, value: any, array: any[]): any[] => { | |
| if (index > array.length) { | |
| return array | |
| } | |
| return array.slice(0, index).concat(value, array.slice(index)) | |
| } | |
| /** | |
| * Returns array without the value at index | |
| * @example | |
| * removeAt(1, [1, 2, 3]) => [1, 3] | |
| */ | |
| export const removeAt = (index: number, array: any[]): any[] => | |
| array.slice(0, index).concat(array.slice(index + 1)) | |
| /** | |
| * Returns array with value at index replaced by another value | |
| * @example | |
| * replaceAt(1, 9, [1, 2, 3]) => [1, 9, 3] | |
| */ | |
| export const replaceAt = ( | |
| index: number, | |
| value: any, | |
| array: any[], | |
| ): any[] => { | |
| if (index > array.length) { | |
| return array | |
| } | |
| return array.slice(0, index).concat(value, array.slice(index + 1)) | |
| } | |
| /** | |
| * Returns true if array starts with the other array | |
| * @example | |
| * startsWith(['a', 'b'], ['a', 'b', 'c']) => true | |
| */ | |
| export const startsWith = (source: string[], target: string[]): boolean => | |
| source.every((value, index) => value === target[index]) | |
| /** | |
| * Returns array with item at fromIndex moved to toIndex | |
| * @example | |
| * moveTo(1, 4, [1, 2, 3, 4, 5, 6]) => [1, 3, 4, 5, 2, 6] | |
| */ | |
| export const moveTo = ( | |
| fromIndex: number, | |
| toIndex: number, | |
| array: any[], | |
| ): any[] => { | |
| // indexes are equals | |
| if (fromIndex === toIndex) { | |
| return array | |
| } | |
| const item = array[fromIndex] | |
| // move down | |
| if (fromIndex < toIndex) { | |
| return [ | |
| ...array.slice(0, fromIndex), | |
| ...array.slice(fromIndex + 1, toIndex + 1), | |
| item, | |
| ...array.slice(toIndex + 1), | |
| ] | |
| } | |
| // move up | |
| return [ | |
| ...array.slice(0, toIndex), | |
| item, | |
| ...array.slice(toIndex, fromIndex), | |
| ...array.slice(fromIndex + 1), | |
| ] | |
| } |
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