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* Check if a value is not undefined
*
* @param {*} value
* @returns {boolean}
*/
export function isDefined(value: any): boolean {
return value !== undefined
}
/**
* Check if value is null
*
* @param {*} value
* @returns {boolean}
*/
export function isNull(value: any): boolean {
return value === null
}
/**
* Check if value is not null
*
* @param {*} value
* @returns {boolean}
*/
export function isNotNull(value: any): boolean {
return value !== null
}
/**
* Check if value is "valid" (not null or undefined)
*
* @param {*} value
* @returns {boolean}
*/
export function isValid(value: any): boolean {
return isDefined(value) && isNotNull(value)
}
/**
* Check if value is a number
*
* @param {*} value
* @returns {boolean}
*/
export function isNumber(value: any): boolean {
return Number.isFinite(value)
}
/**
* Check if value is an integer number
*
* @param {*} value
* @returns {boolean}
*/
export function isInteger(value: any): boolean {
return isNumber(value) && Number.isInteger(value)
}
/**
* Check if value is a float point number
*
* @param {*} value
* @returns {boolean}
*/
export function isFloat(value: any): boolean {
return isNumber(value) && !isInteger(value)
}
/**
* Check if value is a boolean
*
* @param {*} value
* @returns {boolean}
*/
export function isBoolean(value: any): boolean {
return is(value, 'Boolean')
}
/**
* Check if value is a string
*
* @param {*} value
* @returns {boolean}
*/
export function isString(value: any): boolean {
return is(value, 'String')
}
/**
* Check if value is an object
*
* @param {*} value
* @returns {boolean}
*/
export function isObject(value: any): boolean {
return is(value, 'Object')
}
/**
* Check if value is an Array
*
* @param {*} value
* @returns {boolean}
*/
export function isArray(value: any): boolean {
return Array.isArray(value)
}
/**
* Check if value is a Date object
*
* @param {*} value
* @returns {boolean}
*/
export function isDate(value: any): boolean {
return is(value, 'Date')
}
/**
* Check if value is a Regular Expression
*
* @param {*} value
* @returns {boolean}
*/
export function isRegExp(value: any): boolean {
return is(value, 'RegExp')
}
/**
* Check if value is a function
*
* @param {*} value
* @returns {boolean}
*/
export function isFunction(value: any): boolean {
return is(value, 'Function')
}
/**
* Check if value is an instance of type
*
* @param {*} value
* @param {string} type
* @returns {boolean}
*/
export function is(value: any, type: string): boolean {
switch (type) {
case 'Integer':
return isInteger(value)
case 'Float':
return isFloat(value)
case 'Array':
return isArray(value)
default:
return instance(value) === type
}
}
/**
* Get the constructor class name of the value
*
* @param {*} value
* @returns {string}
*/
export function instance(value: any): string {
return isValid(value)
? value.constructor.name
: isNull(value)
? 'Null'
: 'Undefined'
}
/**
* Check if value is empty.
* Only for string, array and objects. Any other type will return false.
*
* @param {*} value
* @returns {boolean}
*/
export function isEmpty(value: any): boolean {
if (isString(value) || isArray(value)) return !value.length
if (isObject(value)) return !Object.keys(value).length
return false
}
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