JavaScript is_infinite

Returns whether argument is infinite

function is_infinite (val) {
    // Returns whether argument is infinite  
    // 
    // version: 1008.1718
    // discuss at: http://phpjs.org/functions/is_infinite    // +   original by: Onno Marsman
    // *     example 1: is_infinite(Infinity);
    // *     returns 1: true
    // *     example 2: is_infinite(-Infinity);
    // *     returns 2: true    // *     example 3: is_infinite(0);
    // *     returns 3: false
    var warningType = '';
 
    if (val===Infinity || val===-Infinity) {        return true;
    }
 
    //Some warnings for maximum PHP compatibility
    if (typeof val=='object') {        warningType = (val instanceof Array ? 'array' : 'object');
    } else if (typeof val=='string' && !val.match(/^[\+\-]?\d/)) {
        //simulate PHP's behaviour: '-9a' doesn't give a warning, but 'a9' does.
        warningType = 'string';
    }    if (warningType) {
        throw new Error('Warning: is_infinite() expects parameter 1 to be double, '+warningType+' given');
    }
 
    return false;}

external links: original PHP docs | raw js source

Examples

» Example 1

Running

1	is_infinite(Infinity);

Should return

true

» Example 2

Running

1	is_infinite(-Infinity);

Should return

true

Dependencies

No dependencies, you can use this function standalone.

Open syntax issues

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Eventually we want all code to pass or at least take into consideration most fixes suggested by JsLint, following this JsLint configuration we’ve decided on.

Authors

Thanks to the following developers, you get to have is_infinite goodness in JavaScript.

Onno Marsman ( original )

Comments

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