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I would like to add data to array. But I want to push start always messages[0] , and shouldnt lost messages datas

this.messages.push(data[0]);

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you want unshift(). push() adds to the end of an array while unshift adds to the beginning (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/unshift)

this.messages.unshift(data);
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