You found a bug! We've classified it as EXTJS-6972 . We encourage you to continue the discussion and to find an acceptable workaround while we work on a permanent fix.
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    Default Ext.Array.sum improvement

    Ext.Array.sum improvement


    The Ext.Array.sum polyfill method should be very similar to the Array.reduce method.

    I suggested adding the callback and initialValue params and delegating to Array.reduce when possible.

    Another option is to leave Ext.Array.sum as is and add the new Ext.Array.reduce method.

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    Pushed as a story. Thank you!
    Mitchell Simoens @SenchaMitch
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    I was searching what Google did... and if they implemented Array.reduce...

    I found this funny inline comment:

    "We're google; we can't have "map" without "reduce" can we?"

    Link

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