Use the strict inequality (!==) operator to check if two strings are not equal, e.g. `a !== b`.
ThetoContainmatcher also works in strings, as we saw in the first example of this book: expect("Hello world").toContain("world"); expect(favoriteCandy).not.toContain("Almond"); Is It Defined? toBeDefined, toBeUndefined As with truthiness and falsiness, there are matchers to check if so...
isDefaultNamespace() Returns true if a specified namespaceURI is the default, otherwise false Element isEqualNode() Checks if two elements are equal Element isFinite() Determines whether a value is a finite, legal number Global, Number isId Returns true if the attribute is of type Id, other...
If they are equal we will return true; otherwise, we will return false. return modifiedStr === reversedStr; Example Below is an example to find if the string is a palindrome using JavaScript String and Array Methods ? Open Compiler // Function to check for Palindrome function isPalindrome...
This may be significantly more condensed than a standard FieldsContent element, which doesn't give you the ability to check whether a field is empty.// Creates a table with only fields that contain data var fields = Schema($feature).fields; function getNames(field){ return field.name; } ...
if (x === 0) { // Is `x` equal to zero? x = 123; } // Defining function `baz` with parameters `a` and `b` function baz(a, b) { return a + b; } 注意等号的两种不同用法: 单个等号(=)用于将一个值赋给一个变量。
If the two values do not have the same type, the == operator may still consider them equal. Use the following rules and type conversions to check for equality: If one value is null and the other is undefined, they are equal. If one value is a number and the other is a string, con...
// Define a function named formatted_string with three parameters: pad, user_str, and pad_posfunctionformatted_string(pad,user_str,pad_pos){// Check if user_str is undefined, if so, return padif(typeofuser_str==='undefined')returnpad;// Check if pad_pos is 'l' (left), if true,...
== Equal >= Bigger or equal > Bigger != Not equal (different)All of these operators result in true or false values. For example, here’s how you could check several conditions:Copy number = 15; if (number > 10) { } // true if (number != 39) { } // true if (number <= ...
before(function() { if (/* check test environment */) { // setup code } else { this.skip(); } }); This will skip all it, beforeEach/afterEach, and describe blocks within the suite. before/after hooks are skipped unless they are defined at the same level as the hook containing ...