By default, throttle will execute the function as soon as you call it for the first time, and, if you call it again any number of times during the wait period, as soon as that period is over. If you need to cancel a scheduled throttle, you can call. Useful for implementing behavior that should only happen after the input has stopped arriving. For example: rendering a preview of a Markdown comment, recalculating a layout after the window has stopped being resized, and so on.
At the end of the wait interval, the function will be called with the arguments that were passed most recently to the debounced function.
Pass true for the immediate argument to cause debounce to trigger the function on the leading instead of the trailing edge of the wait interval.
Useful in circumstances like preventing accidental double-clicks on a "submit" button from firing a second time. If you need to cancel a scheduled debounce, you can call.
Repeated calls to the modified function will have no effect, returning the value from the original call. Useful for initialization functions, instead of having to set a boolean flag and then check it later.
From the count -th call onwards, it starts actually calling function. Useful for grouping asynchronous responses, where you want to be sure that all the async calls have finished, before proceeding. From the count -th call onwards, the memoized result of the last invocation is returned immediately instead of invoking function again.
So the wrapper will invoke function at most count - 1 times. This allows the wrapper to execute code before and after the function runs, adjust the arguments, and execute it conditionally. In math terms, composing the functions f , g , and h produces f g h.
Transform the value of each property in turn. The opposite of object. For this to work, all of your object's values should be unique and string serializable. Basically, Object. Returns the key where the predicate truth test passes or undefined. Any nested objects or arrays will be copied by reference, not duplicated. It's in-order, so the last source will override properties of the same name in previous arguments.
Alternatively accepts a predicate indicating which keys to pick. Alternatively accepts a predicate indicating which keys to omit. The primary purpose of this method is to "tap into" a method chain, in order to perform operations on intermediate results within the chain. If path is a string, it is wrapped in a single-element array; if it is an array already, it is returned unmodified.
If the property does not exist or is undefined , the optional default is returned. Identical to object. Takes an object and returns a function which will return the value of a provided property. For other objects, it returns true if the object has no enumerable own-properties. Note that primitive numbers, booleans and symbols are always empty by this definition. Note that JavaScript arrays and functions are objects, while normal strings and numbers are not. Note: this is not the same as the native isNaN function, which will also return true for many other not-number values, such as undefined.
Returns a reference to the Underscore object. Useful as the default for optional callback arguments. Each invocation of iteratee is called with an index argument. Produces an array of the returned values. If you only pass one argument, it will return a number between 0 and that number. Returns the Underscore object to facilitate chaining. If prefix is passed, the id will be appended to it. If a default value is provided and the property doesn't exist or is undefined then the default will be returned.
If defaultValue is a function its result will be returned. When you evaluate a template function, pass in a data object that has properties corresponding to the template's free variables. You can also use print from within JavaScript code. If ERB-style delimiters aren't your cup of tea, you can change Underscore's template settings to use different symbols to set off interpolated code. Define an interpolate regex to match expressions that should be interpolated verbatim, an escape regex to match expressions that should be inserted after being HTML-escaped, and an evaluate regex to match expressions that should be evaluated without insertion into the resulting string.
Note that if part of your template matches more than one of these regexes, the first will be applied by the following order of priority: 1 escape , 2 interpolate , 3 evaluate. You may define or omit any combination of the three. For example, to perform Mustache. By default, template places the values from your data in the local scope via the with statement.
However, you can specify a single variable name with the variable setting. This can significantly improve the speed at which a template is able to render. Precompiling your templates can be a big help when debugging errors you can't reproduce. This is because precompiled templates can provide line numbers and a stack trace, something that is not possible when compiling templates on the client. The source property is available on the compiled template function for easy precompilation.
You can use Underscore in either an object-oriented or a functional style, depending on your preference. The following two lines of code are identical ways to double a list of numbers. Calling chain will cause all future method calls to return wrapped objects. When you've finished the computation, call value to retrieve the final value.
In addition, the Array prototype's methods are proxied through the chained Underscore object, so you can slip a reverse or a push into your chain, and continue to modify the array. Calling methods on this object will continue to return wrapped objects until value is called. Includes OOP-wrapping and chaining. Tailored for PHP 5. Underscore-perl , a Perl port of many of the Underscore.
Underscore-java , a java port of the functions that are applicable in both languages. Ruby's Enumerable module. Oliver Steele's Functional JavaScript , which includes comprehensive higher-order function support as well as string lambdas. Michael Aufreiter's Data. Funcy , a practical collection of functional helpers for Python, partially inspired by Underscore. It is important to understand that these operators are only meaningful for numbers and strings.
You can throw any value to them, but JavaScript will convert the operands to string or number first before performing the actual comparison. Buy now from Amazon. Bram Hengeveld Nov 11, Updated: Nov 11, View more products.
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