API: Verify

isObject JavaScript

Check whether the given data is of type Object. Returns false for other data types including Array.

Parameters

• data::any

Returns

boolean

Examples

_.isObject([1, 2, 3]); // Returns false
_.isObject({ a: 1, b: 2 }); // Returns true

isEqual JavaScript

It compares the first argument value as the left operand and the argument values given thereafter as the right operand, and returns true if the values are all the same.

isEqual returns true even if the data types do not match, but isEqualStrict returns true only when the data types of all argument values match.

Parameters

• leftOperand::any
• rightOperand::any||any[]||...any

Returns

boolean

Examples

const val1 = 'Left';
const val2 = 1;

_.isEqual('Left', 'Left', val1); // Returns true
_.isEqual(1, [1, '1', 1, val2]); // Returns true
_.isEqual(val1, ['Right', 'Left', 1]); // Returns false
_.isEqual(1, 1, 1, 1); // Returns true

isEqualStrict JavaScript

It compares the first argument value as the left operand and the argument values given thereafter as the right operand, and returns true if the values are all the same.

isEqual returns true even if the data types do not match, but isEqualStrict returns true only when the data types of all argument values match.

Parameters

• leftOperand::any
• rightOperand::any||any[]||...any

Returns

boolean

Examples

const val1 = 'Left';
const val2 = 1;

_.isEqualStrict('Left', 'Left', val1); // Returns true
_.isEqualStrict(1, [1, '1', 1, val2]); // Returns false
_.isEqualStrict(1, 1, '1', 1); // Returns false

isEmpty JavaScript

Returns true if the passed data is empty or has a length of 0.

Parameters

• data::any?

Returns

boolean

Examples

_.isEmpty([]); // Returns true
_.isEmpty(''); // Returns true
_.isEmpty('abc'); // Returns false

isUrl JavaScript

Returns true if the given data is in the correct URL format. If withProtocol is true, it is automatically appended to the URL when the protocol does not exist. If strict is true, URLs without commas (.) return false.

Parameters

• url::string
• withProtocol::boolean || false
• strict::boolean || false

Returns

boolean

Examples

_.isUrl('google.com'); // Returns false
_.isUrl('google.com', true); // Returns true
_.isUrl('https://google.com'); // Returns true

is2dArray JavaScriptDart

Returns true if the given array is a two-dimensional array.

Parameters

• array::any[]

Returns

boolean

Examples

_.is2dArray([1]); // Returns false
_.is2dArray([[1], [2]]); // Returns true

contains JavaScriptDart

Returns true if the first string argument contains the second argument "string" or "one or more of the strings listed in the array". If the exact value is true, it returns true only for an exact match.

Parameters

• str::any[]|string
• search::any[]|string
• exact::boolean || false Dart:Named

Returns

boolean

Examples

_.contains('abc', 'a'); // Returns true
_.contains('abc', 'd'); // Returns false
_.contains('abc', ['a', 'd']); // Returns true

between JavaScriptDart

Returns true if the first argument is in the range of the second argument ([min, max]). To allow the minimum and maximum values to be in the range, pass true for the third argument.

Parameters

• range::[number, number]
• number::number
• inclusive::boolean || false Dart:Named

Returns

boolean

Examples

_.between([10, 20], 10); // Returns false
_.between([10, 20], 10, true); // Returns true

len JavaScriptDart

Returns the length of any type of data. If the argument value is null or undefined, 0 is returned.

Parameters

• data::any

Returns

boolean

Examples

_.len('12345'); // Returns 5
_.len([1, 2, 3]); // Returns 3

isEmail JavaScriptDart

Checks if the given argument value is a valid email.

Parameters

• email::string

Returns

boolean

Examples

_.isEmail('[email protected]'); // Returns true

isTrueMinimumNumberOfTimes JavaScriptDart

Returns true if the values given in the conditions array are true at least minimumCount times.

Parameters

• conditions::boolean[]
• minimumCount::number Dart:Named

Returns

boolean

Examples

const left = 1;
const right = 1 + 2;

_.isTrueMinimumNumberOfTimes([true, true, false], 2); // Returns true
_.isTrueMinimumNumberOfTimes([true, true, false], 3); // Returns false
_.isTrueMinimumNumberOfTimes([true, true, left === right], 3); // Returns false