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Test whether every property of an object fails a test implemented by a predicate function.
To use in Observable,
noneInBy = require( 'https://cdn.jsdelivr.net/gh/stdlib-js/utils-none-in-by@umd/browser.js' )
The previous example will load the latest bundled code from the umd branch. Alternatively, you may load a specific version by loading the file from one of the tagged bundles. For example,
noneInBy = require( 'https://cdn.jsdelivr.net/gh/stdlib-js/utils-none-in-by@v0.1.1-umd/browser.js' )
To vendor stdlib functionality and avoid installing dependency trees for Node.js, you can use the UMD server build:
var noneInBy = require( 'path/to/vendor/umd/utils-none-in-by/index.js' )
To include the bundle in a webpage,
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/utils-none-in-by@umd/browser.js"></script>
If no recognized module system is present, access bundle contents via the global scope:
<script type="text/javascript">
(function () {
window.noneInBy;
})();
</script>
Tests whether every property of an object
fails a test implemented by a predicate
function.
function isUnderage( age ) {
return ( age < 18 );
}
var obj = {
'a': 28,
'b': 22,
'c': 25
};
var bool = noneInBy( obj, isUnderage );
// returns true
If a predicate
function returns a truthy value, the function immediately returns false
.
function isUnderage( age ) {
return ( age < 18 );
}
var obj = {
'a': 12,
'b': 22,
'c': 25
};
var bool = noneInBy( obj, isUnderage );
// returns false
The invoked function
is provided three agruments:
value
: property valuekey
: property keyobject
: input object
To set the function execution context, provide a thisArg
.
function sum( value ) {
if ( value < 0 ) {
return true;
}
this.sum += value;
this.count += 1;
return false;
}
var obj = {
'a': 1,
'b': 2,
'c': 3,
'd': 4
};
var context = {
'sum': 0,
'count': 0
};
var bool = noneInBy( obj, sum, context );
// returns true
var mean = context.sum / context.count;
// returns 2.5
-
If the 1st argument is not an object or the second argument is not a fuction , the function throws a Type Error.
-
If provided an empty object, the function returns
true
.function truthy() { return true; } var bool = noneInBy( {}, truthy ); // returns true
-
The function does not skip
undefined
elements.function log( value, index ) { console.log( '%s: %s', index, value ); return false; } var obj = { 'a': 1, 'b': NaN, 'c': NaN, 'd': 4 }; var bool = noneInBy( arr, log ); /* => 0: 1 1: undefined 2: undefined 3: 4 */
<!DOCTYPE html>
<html lang="en">
<body>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/utils-none-in-by@umd/browser.js"></script>
<script type="text/javascript">
(function () {
function isUnderage( age ) {
return age < 18;
}
var obj = {
'a': 26,
'b': 20,
'c': 25
};
var bool = noneInBy( obj, isUnderage );
// returns true
})();
</script>
</body>
</html>
This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.
See LICENSE.
Copyright © 2016-2024. The Stdlib Authors.