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| /** | |
| * This module provides native variable type checking utilities | |
| * It has no external dependencies | |
| * Single-line functions used for conciseness | |
| * No parsing or coercion is performed | |
| */ | |
| const TypeUtils = { | |
| // Strings | |
| isString: value => typeof value === 'string', | |
| // Number | |
| isNumber: value => !isNaN ( value ) && typeof value === 'number', | |
| // Integer | |
| isInteger: value => parseInt ( value, 10 ) === value, | |
| // Float | |
| isFloat: value => ('' + value).includes ( '.' ) && parseFloat ( value ) === value, | |
| // Infinite | |
| isInfinite: value => value === Infinity, | |
| // Boolean | |
| isBoolean: value => [ false, true ].includes ( value ), | |
| // Object | |
| isObject: value => typeof value === 'object' && !Array.isArray ( value ), | |
| // Array | |
| isArray: value => Array.isArray ( value ), | |
| // Array-like - Array, Set, Map | |
| isArrayLike: value => value instanceof Set || value instanceof Map || Array.isArray ( value ), | |
| // Function | |
| isFunction: value => typeof value === 'function', | |
| // Null | |
| isNull: value => value === null, | |
| // Undefined | |
| isUndefined: value => value === undefined, | |
| // Null or undefined | |
| isNullOrUndefined: value => [ null, undefined ].includes ( value ), | |
| // Empty | |
| // Numbers, Booleans aren't ever considered "empty" | |
| isEmpty: value => { | |
| // Null / Undefined | |
| if ( TypeUtils.isNull ( value ) || TypeUtils.isUndefined ( value ) ) { | |
| return true; | |
| } | |
| // String | |
| if ( TypeUtils.isString ( value ) && value.length === 0 ) { | |
| return true; | |
| } | |
| // Arrays | |
| if ( TypeUtils.isArray ( value ) ) { | |
| return value.length === 0; | |
| } | |
| // Sets, Maps | |
| if ( TypeUtils.isArrayLike ( value ) ) { | |
| return value.size === 0; | |
| } | |
| // Objects | |
| if ( TypeUtils.isObject ( value ) && Object.keys ( value ).length === 0 ) { | |
| return true; | |
| } | |
| return false; | |
| }, | |
| // Date | |
| isDate: value => { | |
| return ( | |
| !TypeUtils.isNullOrUndefined ( value ) | |
| && value.constructor === Date | |
| && TypeUtils.isInteger ( value.getTime () ) | |
| ); | |
| }, | |
| // Promise | |
| isPromise: value => Boolean ( value && TypeUtils.isFunction ( value.then ) ) | |
| }; | |
| module.exports = TypeUtils; |
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