Test whether every iterated value fails a test implemented by a predicate function.
var iterNoneBy = require( '@stdlib/iter/none-by' );Tests whether every iterated value fails a test implemented by a predicate function.
var array2iterator = require( '@stdlib/array/to-iterator' );
function predicate( v ) {
return ( v <= 0 );
}
var arr = array2iterator( [ 1, 1, 1, 1, 1 ] );
var bool = iterNoneBy( arr, predicate );
// returns trueIf a provided iterator does not return any iterated values, the function returns true.
var array2iterator = require( '@stdlib/array/to-iterator' );
function predicate() {
return true;
}
var bool = iterNoneBy( array2iterator( [] ), predicate );
// returns trueA predicate function is provided two arguments:
- value: iterated value.
- index: iteration index (zero-based).
To set the execution context of the predicate function, provide a thisArg.
var array2iterator = require( '@stdlib/array/to-iterator' );
function predicate( v ) {
this.count += 1;
return ( v <= 0 );
}
var arr = array2iterator( [ 1, 1, 0, 1, 1 ] );
var ctx = {
'count': 0
};
var bool = iterNoneBy( arr, predicate, ctx );
// returns false
var n = ctx.count;
// returns 3- The function immediately returns upon encountering a truthy return value.
var randu = require( '@stdlib/random/iter/randu' );
var iterNoneBy = require( '@stdlib/iter/none-by' );
function threshold( r ) {
return ( r >= 0.99 );
}
// Create an iterator which generates uniformly distributed pseudorandom numbers:
var opts = {
'iter': 100
};
var riter = randu( opts );
// Determine if all values are below a threshold:
var bool = iterNoneBy( riter, threshold );
// returns <boolean>
console.log( bool );@stdlib/iter/any-by: test whether at least one iterated value passes a test implemented by a predicate function.@stdlib/iter/every-by: test whether every iterated value passes a test implemented by a predicate function.@stdlib/iter/for-each: create an iterator which invokes a function for each iterated value before returning the iterated value.@stdlib/iter/none: test whether all iterated values are falsy.@stdlib/iter/some-by: test whether at leastniterated values pass a test implemented by a predicate function.