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